Last year was my first year for duck hunting. I was asking the same questions as you. I ended up buying the cabelas supermag 1600 gram thinsulate. However, I believe the "ultimate" by cabelas is nice as well. I like them because they don't have buckles on the shoulders, just velcro.
Where I live the temps can be anywhere from above freezing in late fall and early winter, to the mid teens in Jan.
I get cold very easily and have had, and tried, everything for cold feet. I've come to the conclusion that my cold feet have more to do with circulation than anything.
My super mags.
Pros: Absolutley do not get cold in them. In fact I've gotten too hot in them while walking which can be extremely dangerous. I love the features on them, except for the shell holder that comes with them. It clips to the rings on the waders, it hangs from the rings. I just wish they had a way to fasten the bottom of the shell holder as well. For you skinny guys it may not be a problem but if you've got a big belly it sticks straight out making it hard to access shells, a problem easily fixed by dropping a few pounds.
Cons:
They are heavy. Though I'm always warm in them, I'm always wet when I remove them, which takes forever to dry them out. This can be a problem if hunting morning and evening or an evening hunt then another hunt the following morning.
Tips:
For ANY wader be sure and buy some fleece wader liners, they're a life saver. They wick away moisture while keeping you warm. Buy a couple of pair. Get the ones with the elastic foot stirrup so they won't ride up on your legs while putting on the wader and while walking.
Make sure to give yourself plenty of room in the foot.
Don't be afraid to pack in your waders and put them on when you arrive at your hunting spot. This is a little trouble but worth it. While your at it, buy or take something to stand on when you change them in the field.
I'll be buying a pair of breatheables this year as well and save my neoprenes for cold, cold weather.
Hope my suggestions help you.