John,
I went through a similar seat selection process a few years ago. My previous experience with aftermarket seats was not all that great. First of all, you do not know just comfortable they are unless you try them out ahead of time (this isn't an easy thing to do when you are mail ordering seats). Second, the quality of aftermarket seat tends to be poor, unless you are buying something more expensive than $600/seat (or so).
My particular problem was with fading of the material. And since then, I have seen numerous faded out aftermarket seats.
Since I didn't want to pay $600+ for new Sparco's or Recaro's I decided to find an OEM seats that would work for my application. At first, I decided to try EVO8 Recaro seats (notice the tight fit in the shoulder area).
That is when I found the next problem: TR7s have relatively tight space around shoulders! That means that seats with prominent shoulder supports will not work! So I had to get rid of my EVO seats (this wasn't a problem as they are VERY desirable!).
As I mentioned several times in the past, I ended up with leather Celica GT seats. I found '02 Celica at a local dealer and went there to test drive the seats. They were very comfortable! And I am sure that Toyota OEM leather will hold up much better than anything you will find on a cheap aftermarket seat!
Even these seats are somewhat tight in the shoulders area, but they are still much better than full "race style" seats.
Leon
'94 Eagle Talon AWD Turbo 613whp <powered by Mitsu 4G63T
'80 TR7 Spyder GS-T <undergoing Mitsu 4G63T transplant
http://www.cardomain.com/ride/2472999