Half the guys in our club have purchased O'neill Assualt Hybrid dry suits. One piece traditional wet suit bottom (3mm) and loose fitting dry suit top. Super comfortable with no upper body restrictions. Most guys buy them a little large for extra room in the bottom, so I can wear long underwear on the bottom to absorb sweat. On the top, I layer what ever is needed for the conditions. Anything from a Lycra compression top, long sleeve cotton top and or a fleece top.
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I have a large and it fits great. I am 6', 170 lbs, 33" legs (1.83m, 77kg, 84cm).