Ski suits vary WIDELY in size by manufacturer.
I'm 6'0", 170lbs and I needed a spyder XL (go figure I'm a medium in every other clothing item). Actually, it was the only brand/size that fit me. Most were too short in the upper body (PAINFUL!) or had too much extra fabric and looked goofy. This was also a couple years ago so things may have changed.
You're heavier than I am so you shouldn't have the problem with it being too baggy, but you're also taller. I would recommend the XL definitely not the L, and if possible try it on at a local shop to make sure it fits, who knows maybe you need an xxl.
the suit bsud has is a good one though, you may be in luck!