Welcome to the addictive world of scuba. Wasnt that long ago i was in the same situation that u r now. One thing I wish had done was to TRY b4 u buy or at least ask lots of questions and take time to look around. The tendency is to rush out and buy your own gear ASAP. I did. I have since changed my mask, fins, hood, bought the wrong knife as well. Even fins can be either very comfortasble or cause aches cramps, there are so many types to try. Pretty happy with my BCD and regs although the computer i bought; well i wouldnt buy the same one with what i know now. Its polite to support the dive shop that you did your course at, but they dont always carry the full range of gear available. For what its worth, after i got my ticket i wish i had hired gear for the first 6 or so times. This would of allowed me to try different gear inc fins, and even different sized tanks, etc which would of made my purchase decision more accurate to my style.. Good luck, enjoy.