[Steve-O]

I think first you need to consider many factors.

What are the temps you are exposed to?
What is the length of exposure?
What is your body type?
Do you get cold easily, or are you always hot?

Larger body types have natural insulation, where as thinner body types need more protection.

There is thickness of suit to consider.
There is stretch to consider.
There is wind protection to consider?
Suits have different types of insulation. Not all suits are made of just neoprene.

Last weekend, it got cold, and I was in a 4/3 full and still a bit chilly. It didn't have any wind protection though. I saw some in shorty's and they were chilly. I would have been freezing in a shorty. I saw some with no suits. I wouldn't have been out with no suit.

This is not a question of brand right now IMO, but more importantly what do you want the suit to do for you? Is it going to fit YOUR needs. Once you define your needs, then you can start finding brands/models that fit what your looking for. No one suit is going to do it all. You will need to aquire a few pieces IMO.

I think this is tougher question than the classic "what kite should I buy?"