240sx was nowhere near a cheap sportscar. technically, it was a pony car, same layout as a mustang/camaro/etc. just a weaker motor.
I remember in 01, you could buy base z28 ls1 camaro for 22k out the door. If anything, that fits the category.
Dodge had an interesting concept a while back - the razor.
It had the 2.4L turbo 4 out of the srt-4, rated at 250 horse, rwd, 6 speed. manual doors, windows, ac optional. This would have been THE perfect sportscar because the plan was to offer base model for 15-16k.
Unfortunately, dodge scrapped it. But it would've been a wonderful starting platform.
Stripped g35? Isn't that a base 350z without rear seats?