KzooJason:I'm currently looking at either the Rec Wing since it supports doubles or the Trek Wing which only supports a single tank but is smaller than the Rec Wing. I'll be travelling with it and wouldn't mind the smaller size. It's unlikely I'll be double tank dives in the immediate future and, even if I need to buy another wing later, having a small one to travel with wouldn't be a bad thing. I considered the Venture or Travel wing but with only 30lbs. of lift I'm concerned that it might not be enough.
Jason, the Trek Wing will accomodate double cylinders as well but not the big 104-cubic-foot cylinders as the Rec Wing will accomodate. Since you are not planning to use doubles in the near future consider getting the Trek Wing. A bladder to big will give you extra drag and allow large pockets of air to slosh from side to side.
About the Venture Wing, unless you are diving in a dry suit (where the bladder should have enough lift to hold you, your gear and a drysuit full of water on the surface) the Venture Wing is an excellent choise for normal recreational diving. 30lbs of lift is enough for even very big cylinders (remember, the cylinder only has a few pounds of negative buoyancy in the water)