I agree with Perrone.
There is a good chance if you don't already know exactly what you want, that you will go and spend $2000 on what you *think* you want, and then in 6 months time you'll spend another $2000 buying the stuff you *know* want.
There is also a very good chance that if you haven't done *real* research before hand, that what the dive shop tells you is best is not actually best for you. First spend some time hiring and if you can, borrowing gear to try as many different brands and setups as you can. At the very least if you aren't able to hire or otherwise try different equipment, talk to other divers in your area. Most divers would be more than happy to talk gear until the cows come home!
And certainly look at second hand equipment. There always seem to be a lot of newly cert'd divers who go out and spend $2k or $3k on equipment, and give it up a year later. But always make sure thats its in good condition, and if possible get someone who knows what they're doing to check it out before parting with $$$.