I'm also about to buy a dry suit. I've found out there's lot's of choices. One piece or two, rear or front zipper, breathing/non breathing canvas, relief zipper, boots, paddings and the list goes on.

I'm going to one piece suit without fly zipper. My aim is to minimize possible leak points. I'm still thinking about rear zipper - I might twist enough to use it. I think I'll go for Ravenspring suit - it's cheap for euro people as the currency ratio is good and it's quite common in here. In addition to suit there's a need for hat or neoprene hood. Cold water feels like hit from baseball bat to bare head. Also most thin drysuits don't have real insulation, you should use clothing under it.

: check out harvey's dry suits , they use to make a shell pak with a relief
: zipper , the down underwear could be purchase seperate. i agree the ankel
: seals would be a pain.with the shell ya just step in and out and still
: have the wrist and neck seals , which can be neo. or rubber.