A bit out of your price range, but anyone with the money could do an awful lot worse than the Goretex lined leather boots made by Dubarry. I have had a pair for four years now and can honestly say that they have transformed my winter fishing. What's more, I don't need to put on an extra pair of socks, though of course you can if you need extra warmth.
Mine are one size larger than I normally take, which ensures there's plenty of room. One thing to watch out for with any footwear is that any extra pairs of socks or additional liners don't restrict movement; if they do you'll reduce blood circulation which means your feet get cold quicker.
Oddly enough I have yet to see another angler wearing Dubarry boots, although they are immensely popular among the riding fraternity. Perhaps the ?180-odd price tag puts anglers off, though I don't know why; they are happy enough to replace their rods once a year...