Biggest issue for me is being 6'3". Fortunately I've got a great race shop nearby called 425 Motorsports. They carry just about every popular aftermarket seat at the store to try out. I found that the best fit for me was this OMP. The Recaro that everyone recommends was too tight around my shoulders.
They are fabricating me up something similar to the Brey Krause floor mount right now, I'll go pick it up on Saturday. With it just sitting straight on the floor I can barely see over the steering wheel, haha.