Gordon,
Your run-down proves that there's a butt for every seat. Mine (apparently) fits a speedster seat. I shelled out for Fibersteel's. I can go almost endlessly in them.
My first car had VS's "comfort" seats, which were like instruments of torture-- 15 minutes, and I was ready to get out. The side bolsters hit me in my pelvis, and I was actually sitting on the sides of the seat-- horribly uncomfortable. Henry's "D" seats, are nearly perfect (except for the fact that I thought they looked insufficiently "racy"), but I didn't really like his speedster seats in '05 (I sat on them, not in them).
The point, I guess, is that a huge part of wanting to drive the car is being comfortable in it. There's no point in spending a king's ransom on an engine and transaxle that can cover a time-zone a day, if the seats make you squirm around after an hour or so. "Fun" is driving, and you've got to be comfortable to drive well.