The Kokatat Supernova "semi" drysuit has just been reduced in price at REI (<$340):

http://www.rei.com/product/722283
Supernova

I've used one for the past season and it is really very good for cat sailing. Full beathing, neoprene neck, Tropos (goretex-light) booties instead of latex, front zip, relief zip (mens & womens styles). I will never go back to latex booties!