Steve,
If you really want a racing seat get a Kirkey aluminim economy racing seat about $125 with high back, rib supports and Vinyl cover. Uncomfortable as hell on the street but will keep you from sliding around in the seat while on the track. If a racing seat feels too comfortable it is probably too big. It must fit tight in order to work properly.
Make the racing seat easily removable so you can put the comfortable seat in for cruising.
BTW any offers for original Connelly leather Cobra seats that I have no use for.
Cranky