buckhunter,
Given the fact that it gets colder than "you know what" back there, I would think that you would want a thicker wader?
I just set aside some 5 year old Herter's titanium 4mm for use when I make an occasional trip to the Refuge and replaced them with a set of Hodgman 5mm / 1000 gram bootfoot Zipper fronts. After 3 uses I find they are very comfortable though my only complaint is the boot is not as sturdy as the Herter's was as they fit more like a tennis shoe rather than a stiff boot. Not bad but just not as supportive as what I was used to. Zipper front is great after all that coffee in the a.m. and they're really easy to put on too.