Cool-weather paddling -- wetsuit, drysuit...

[lefty]

Druminator mentioned recommending a wetsuit for cooler-weather paddling. I got to thinking about this... (dangerous pastime, I know...)

Druminator mentioned that wetsuit booties and bottoms could cost in the $100 range. If I'm not mistaken, once you get off the bottom price tier of waders, you're looking $140 and up. A wetsuit seems to have the advantage of not filling up with water and drowning you if you step into a hole. So why would anybody pay extra money for waders instead of a wetsuit? Is there anything other than the macho look? or simple tradition?

I read one brief article on About.com about these outfits -- apparently there's no such thing as a partial drysuit, is that right? It cinches tight at the edges and keeps you dry inside, whereas a wetsuit traps a small amount of water, which then remains warm.

In a wetsuit, how does the water get inside to begin with, without being able to circulate (and chill) afterward?

When you're paddling with a wetsuit, would you add additional insulating layers (I'm thinking wool) on top, or does the wetsuit (I'm thinking bottoms in particular) keep you warm enough?

Thankx for tolerating the novice questions
Lefty