The nices seats I've tried are the Recaro SPA/SPG (which I ended up buying), the Cobra Evolution above (slightly too thin for my shoulders, and XL was too large in the hips and a pain to fit), OMP and Racetech seats.
Your best best is to try them on, as their is a lot of variables. I've got a relatively thin waist, but wide shoulders and I'm tall so it was difficult finding a seat where the harness holes sat high enough, and that I wasn't swimming around in the bottom section. They're all good at that price range in my opinion, so get whichever feels nicest.