I have Neosport XXL tri sprint wetsuit  (xxl chest 44-46 waist 39-41 210-230lbs)  Im the same build as you but 6' and it fits me great. Not to tight, just right.. very happy with it.

http://www.amazon.com/NeoSport-Triathlon-Fullsuit-Triathlete-Authorized/dp/B001M9OKI6/ref=sr_1_1?ie=UTF8&qid=1324474066&sr=8-1

With your build I would recommend the Neosport Sleeveless.  I was your basically your size when I started doing triathlons(I am 5'11' and wieghed at the time 250-260) you will have better luck fitting into a sleeveless suit.  I have since lost some size and wiegh about 210.  And I now have a BlueSeventy Reaction suit.  If you have 3 or four months before you compete I would advise possibibly waiting if possible as you train you will drop down a few sizes if you are going to be doing a triathalon this spring.  And if you would like i can sell you my neosport Triathalon sleeveless wetsuit.  I make you a good deal if interested.  Good Luck hope this helps you!

I'm about your size (6'1", 250) and I wear a Body Glove Triad XXL Sleeveless.  I've had it for 6 years and have been very pleased with it.  I got it when I was about 275 and it was slightly snug.  As the weight has come off, the suit has become more comfortable.