Just some general statements about shopping for a shop: (nothing specific to Sea Sports or any other shop)
Don't forget to try gear before you buy, you do not have to have all your gear for the certification class. The shop should provide wet suits, tanks, BC, Regulators, etc. (if not find another shop)
You probably will want your own "personal gear", mask, fins, snorkel, boots, and gloves. See if they have different fins you can try in the pool before you buy a set. Remember you DO NOT have to buy all your gear from that one shop. Stuff is expensive and don't feel bad to look for a good deal, or ask the shop to price match or come close. (it does help to have a local shop that does service the brands you do buy) But do not fall for the "you will die if you don't buy from me" tactics, or if they refuse to service something not bought from them (if they carry/service that brand).
Try as many brands of BC's you can find, each manufacturer makes things a little different and everybody is a little different, so search around until you find something that fits YOU like a glove and has the features YOU want.
Depending on how much you plan on diving initially, try renting for a while and buy the stuff bit by bit, spreads out the capital outlay. Renting also gives you a chance to try other gear from other shops. The first piece of gear I always suggest people buy, after their "personal gear," BUY YOUR OWN WETSUIT.
Good luck and have fun!!