For some general tips, experiences, and pointers - check out my two seat articles in the Tech Section over at CustomTacos (
www.customtacos.com).
If you're willing to invest some 'sweat equity' on the install (fabbing / tweaking / etc.) you can get the most seat for the $$$$$ by transplanting better OEM units from another vehicle.
Unless you go the new seat route (Sparco, König, Recaro, Corbeau, etc.) you probably won't be able to avail yourself of the custom sliders / brackets that'd make install a breeze.
As I always preach - the seats are the easy part - it's the mounts that'll have you tearing your hair out.