Mark,
There has been a LOT written about this subject on here. Use the "search" function on the tool bar and look up "wetsuits", or "freediving wetsuits".
Having said that, I have owned suits from Picasso, Esclapez, Cressi-sub and Elios. Elios suits are my, hands-down, favorites so far. You could start by emailing the company and having them walk you through the proccess of getting the right suit for you- as they have hundreds of options.
You will find that freediving suits are harder to put on, but much warmer and easier to move in, than a normal scuba wetsuit.
Jon