
Everyone is different when it comes to dive equipment. Some people believe in getting only the basics while others believe they should put the Cousteaus to shame with the amount of gear they buy.
Somewhere in between is probably good. You should definitely, and a lot of dive schools insist on this, have your own mask, snorkel and fins. Make sure the stuff you buy works for you. Don't be fooled into buying the latest and greatest just because you saw someone else using it. Your instructor should be able to assist you in choosing the right mask. Fins are a bit more of a personal choice - again buy what works for you. This is not necessarily what everyone else is using but that doesn't matter as long as you're happy with your choice.
Good fins to look out for on eBay are Scubapro Jetfins. Usually quite inexpensive these are the fin of choice with most military and commercial divers for a reason. Made from very hard wearing rubber, they are stiff and very powerful. While they might not be the best fin for starting a dive career due to their weight, they are the most powerful fins I have ever used. With a bit of practice you'll be able to swim backwards with these. Due to their short, stiff and powerful blades they can be used to perform any type of kick with the greatest of ease. Two types are generally available; a long blade version and the more coveted by cave divers and much harder to find, short blade version.
Next time you see someone dive with the latest and greatest fin, ask yourself how many different styles of kick such a fin would allow. Most will allow only a scissor kick. Nothing wrong with doing a scissor kick but this is not really the most efficient means of propulsion in the water. Who wants to kick all the time? Kick, kick, kick, kick. I get tired just thinking about it. Much better to kick, glide 5 metres or so, kick, glide 5 metres or so etc. You'll be a lot less tired, conserve a lot of air and see a lot more.
Now, a big one. Do you or don't you buy your own dive computer? Your own regulator? And wet suit? What about a BCD? Oh, Oh, Oh! A big shiny knife to strap to your leg. And so on and so on...
Who has time on holiday to calculate dive times and repetitive dive intervals using a bunch of dive tables? Take the guesswork out of it and buy yourself a dive computer. They are surprisingly cheap new, and even cheaper when used. I paid £20 for a decent Suunto Solution on eBay that I use as a backup if my Aladin should ever fail. Also, nowadays Nitrox-capable computers are the norm rather than the exception. The latest and greatest are of course very nice to have and these start off at quite low prices, depending on what you're looking for.
Having worked in the dive industry for a number of years I would never consider using a dive school wet suit. These get used (and abused!) by everyone and his uncle. You may want to invest in a hydroskin. This is a thin, close fitting lycra suit that can be worn under a wetsuit. The ultra-smooth fabric reduces friction between the skin and a wetsuit, and aids with the donning of the suit. In addition, it reduces the chafing that can occur when wearing a tight or ill-fitting suit - it also keeps the, erm...,it keeps your skin from contact with the wetsuit. Not a problem if the wetsuit is your own, but if it is a rented one you might not want to have too close contact with it. Thumb loops prevent the sleeves of the garment from riding up and a minimum of seams has been used to maximise the comfort of the garment against the skin.
The same goes for regulators. Having your own regulator from new means you know exactly how much, and how hard it's been used. Buy what you're comfortable with, and something you know that works for you. My first regulator of choice is a Scubapro G250HP with a R190 octopus and a Mk 25 first stage. A lot of people will pull their noses up at it because it's not the latest and greatest, however the only thing that matters is the fact that it works for me. I know I can trust it at any recreational depth, at any temperature I care to dive in, and inside any cave.
My second regulator is a Poseidon Cyklon 5000 with Cyklon octopus that I picked up on eBay for £90.00. (You don't need to have second set of regulators - I just like toys!) It goes without saying that if you should buy a regulator off eBay it is a good idea to have it professionally serviced by an authorised service and repair centre before using it. Poseidon regs are well-known for their ruggedness and ease of repair, but such servicing and repairs should only be undertaken by qualified personnel. Lots of cave divers swear by Poseidon, and it's easy to see why. They can even be taken apart underwater! Extremely reliable regs and a very good buy at any price. (and no, mine are not for sale!)
Forget the knife. Lots of places won't allow you to dive with them, because you're usually in a marine park. Easier and safer to use, is a line cutter (or a pair of shears if you're liable to run into fishing nets.) If you feel you have to get a knife then get one that you can attach to your BCD. Strapping a big knife to your leg is an entanglement hazard, spoils your streamlining, and makes you look like a SeaHunt extra.
The next big one is a BCD, or buoyancy compensating device. It is also referred to as a stab jacket, or stabilization jacket by some. Whatever you want to call it, make sure it fits properly, and has enough lift capacity to keep your face comfortably out of the water. My personal preference is for a BCD that has enough lift to keep my face out of the water, while I'm supporting my dive buddies weight. In other words, it has enough lift to keep both of our faces out of the water without either of us having to do more than just hang on.
Any BCD can keep you neutrally buoyant under water, it doesn't take a lot of lift to do that, but a BCD that can keep two grown men on the surface is a bit harder to find, so don't just buy the first BCD that comes to hand. You can start by observing your instructor's choice; chances are good that his BCD will keep two people afloat. In fact, ask him if you can try it on. Most people will talk your ear off about the benefits of their equipment and will be more than happy for you to try it on in the pool.
Why don't you have a look and see if there's anything that you like at my Amazon store
Scuba Goodies! I look for all the coolest bargains on Amazon and list them in Scuba Goodies. If something makes it into my store you can bet it's worth a look! Have a look and see if you too can snag yourself a bargain.