Hi, I am a 661-sponsored racer and own the '05 Pressure Suit. Sounds like my build is very similar to yours, except that I am 6'-1" and am in the 160-170# range.
EDIT:>> I am wearing the Medium 05 and it is still on the roomy side. I have all of the adjuster straps cinched up as far as they go. So, if the 06 Pro runs a little small for the rated size, the Med. should finally fit like a glove.
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If you want to be sure, call the toll-free number: 1-888-520-4888 and ask for Sean (that's pronounced "seen" rather than "shawn"). He's VERY knowledgeable about the PS - - he helped me fit right for mine - - as he races with one too.
And you're gonna get a lot of flack from other posters "Get Dainese"..."Get RockGardn" etc. Pay no attention - - you're going with the
BEST. Call Sean and good luck !