Breathable waders are definately the way to go. Believe it or
not, you can get too hot and sweaty when the waders aren't
breathable, even in very cold water. What I like to do is wear
thermals or sweatpants underneath the breathable waders if I
need to stay warmer. I prefer that over wearing neoprene since
you'll be dry inside when you take the waders off. I have some
coupons that may get you a good deal on waders on my site
below (e.g., 20% off coupon for Sports Authority).

Tom
www.tacklethief.com