The Sparco Sprints I bought are a fixed-back design (FYI). When I installed them in the Swift GTI Hatch, it made the rear seat completely useless. Not only are the fixed back seat an issue, but the routing of the harnesses prevented anyone from sitting back there.

What vehicle are these seats going into?
Is back seat access an issue?
What are your intentions for using the seats? (Auto-X, Street Perfomance, etc.)
What's your budget?

The best piece of advice I can give is to NEVER cheap-out on safety equipment. Ever.