ORIGINAL: Roskoe
I would go with quality wool over the neoprene. Try a pair of thin polypropelene liners under the wool. Wool will keep you warm even when wet, and doesn't create a sauna environment for your feet like neoprene.
This is same method I employ as well. The polypro socks wick the moisture away from you skin, but the wool still stays warm even if moist. Plus, with the double sock, blisters are pretty much non-existent.