Regarding Corbeaus,
I think there are a great seat for the $$ if orginality is not an issue. I am running two different kinds in me couper's 'custom' interior.
The driver side is a FIA race/track legal model called the Forza (two widths availlable, various material options) and it is a fixed back/position mandated by the race clubs. For the passenger I had another fixed Forza but got anoyed at the lack of access to the rear seat/luggage area (my coupe now has a seat delete kit) so I replaced the Forza with a Corbeau TRS which looks similar to the Forza. The fold down feature is a must for easy rear access in our coupes. I used the Corbeau sliders for adjustment and fab'd some brackets to bolt it all up.
My buddy (navigator) loved the TRS on our recent romp thru the Sierras stating he thought it was much more comfortable than the seat in his Land Rover Discovery, I agree it is very nice. Comparing the Corbeaus to other brands, it becomes aesthetic preference and body fit. My brother has a Recaro race legal seat in his racer, its a bit lighter and tighter...and a bit harsher on the bum (I had to add a pillow for one long trip we made!) Great on track but I'd say a bit snug for daily use, the Corbeaus seemed to have a slightly more relaxed fit around the seat area. I am using lap belts until the roll bar goes in, then it will get the 5pt harnesses.
So, find a dealer and try some various brands on, you might like something. If you like spirited driving, they are a huge improvement over the stock seats. Vintage Recaros from early 3 & 5 series are great options also, but are getting harder to find.
www.corbeau.com no affiliation, just a satisfied customer.
HTH
-shanon