I agree with Shelley.
I have been using Sealskinz socks over the last two winters and have been very happy with their performance. They are much more comfortable than neoprene socks (which I used to use) as your feet remain dry. They breathe as well, but can get a bit sweaty if pedaling hard with our humid conditions. I use a thinner activent sock as a first layer and that has been the best combination.
I wear New Balance 92O water shoes over the socks. The Sealskinz allow me to stand in the water to launch and as long as the water isn't over the top of the sock my feet are dry. I ended up getting the longer 'waterblocker' version which allow you to stand in deeper water than the standard Sealskinz.
This winter I got their Sealskinz gloves and like them better than my previous neoprene gloves. No more sweaty hands.
Bear in mind that the socks are made of three layers and have an odd bulky feel. Best worn with a size larger than normal shoe.
I kayak all winter and have found Goretex Paclite jackets and pants to be the best gear for our temperate conditions. Our Winter temps rarely get down to zero degrees C though, averaging around 9C and the coldest water temp would be about 16C. Similar to Florida I believe.