joshr502:Scubapro has just come out with a new semi dry suit that is supposed to be great. It's called the Scotia.
http://www.scubastore.com/product.asp?pais=United%20States%20Of%20America&idioma=eng&id_familia=12&id_subfamilia=53&id_modelo=4153&id=53&marca=SCUBAPRO&desde=0&fromhbx=subfamilia#
I used the scotia also (I am now a softy drysuit Diver ) and regularly dived in water 10oC/50oF and was fine for 40mins+