DiveMe:I got a bigger size to complete my cert, then went wetsuit hunting. I found the Henderson Hyperstretch and have never looked back. The stretchiness has kept me from feeling constricted and it made all the difference in the world for me.
Since you're a rather large man, I might suggest that you consider having a wetsuit custom made for yourself. Even if it winds up costing considerably more, the comfort will be worth every dime.
We get a lot of big guys in Texas, and we keep in stock up through 4X hyperstretch in 3's and 5mil. They are very forgiving on the size chart! So much so that we almost never have to have custome ones done.