Their glass seats aren't too bad. Here's a random website with prices:

http://www.motorspot.com/seats.html

The Grip would probably suit you well. And the RS is slightly more roomy in case you want a little air once in a while.

Here's the sizing chart:

http://www.motorspot.com/seatchart.htm

Measure your ass, ribs and shoulders. If your match is in your price range you win.