no matter what you decide on, if it's on rails, it needs to have a back brace according to SCCA. first, I'd look for a set of double-locking rails a'la sparco in place of the factory bits. I prefer FIA seats, but you're into $2k+ stuff if you want one that has provisions for a back brace built in (RaceTech, the 4009W/HRV is the least expensive). so the second option is to find a seat you like and can afford, then fabricate a back brace following the logic in this and similar threads - don't drill into composites, distribute the load, and if at all possible, build in a fail point to allow it to deform with the seat flex.
good luck.
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