First decision is to decide what type of seat you want... full featured and comfortable with reclining ability and nice padding, or something a little more spartan that's rigid and will make your butt numb after two hours of driving?
I have Corbeau TRS seats in my Civic and they're extremely comfortable while still holding me in nice and tight around the corners, and I also have one Corbeau Forza in my CRX. It's a lot simpler than the TRS, weighs half as much, and beats the hell out of your butt after a long road trip. One's a normal seat, one's a "race only" seat. They can both take 4 point harnesses, but the race seats will almost require it because your stock belt will not sit right across your hips (unless you're really big).
Put a post out on your local boards and see if people will let you sit in their seats. That's what I did before I bought my first set.