The best waders I have found so far are BARE Supras. They are 3.5 mill Hgh dnsity neoprene with a special coating on the inside that reflects your body heat back to you, Very warm!!!! They make them in bootfoot and stocking foot models.
Personally I think stocking foot are the way to go. Just wear a sock liner and one pair of heavy wool socks. Make sure you you have plenty of room to move your tose and you will be warm all day. Most people wear there wading boots too tight and thats why there feet get cold.
I have had these waders for 4 years, no leaks or holes yet.......