Hey guys, I'm new to Tech diving and I'm trying to get gear together for a class this summer. I have looked at the OMS 100 lb. lift double bladder BC with the rubber bands around it and have also looked at the Apeks WTX6R "Buoyancy Cell". Do you need double bladder, It seems like a little more redundancy and safer to me, but I don't know? Which one would you choose and WHY? I've pretty much settled on getting the XTX200 regs, but I'm open to suggestion. Also why would you get HP tanks vs LP tanks? I've heard that the LP's are easier on the regulators, any truth to this? Any comments , suggestions, critiques, or constructive criticism is really appreciated.