Where's the original poster?

I don't see how you could get a G35 coupe in that price range (other than at auction or a private sale with high mileage). Most of the other cars on your list don't do anything for me. If you're willing to forego the back seats, I would consider a 350z or a newer Toyota MR2 (if you like convertibles), the latter should be under your price limit and/or super-low miles.

If you're willing to put some money into it and don't mind higher mileage, for under $10k I would add add an older MR2 ('91-93) and the Miata to the list. This is all based on my personal preferences. If you *really* want backseats, and don't mind an older (but pretty timeless IMO) body design, maybe add a 300zx 2+2.