I'm 6'2" and 320. I do have an athletic build for as much as I weight. I use an original playseat (the one without the center post between your legs) and it's fine for me. I have some adjustibility if I wanted to move the wheel, or pedals further away from me.
I did do some exta bracing to the base of the seat and a homemade shifter mount and modify the pedal deck to accept the G27 pedals.
The seat is comfortable and you can actually spread the side bolster in the seat if you needed to. What it comes down to, is how big is your posterior and will it fit comfortably in the seat?