I agree whole heartedly with Wilko's advice. Wetsuits are almost like shoes in that regard: the model that works best for me will not necessarily work well for others.
If you can find a local shop that has a good stock, see if you can't take various suits out for a trial swim before you commit.
If you're not averse to a two-piece suit, have a look at the De Soto line of suits. Since you buy the top and bottoms separately, you can really dial in a fit for your body type.
If budget is more important to you, have a look at http://www.xterrawetsuits.com/promo/
They've got sleeveless models for US$99 and fullsuits for US$149.