Okay, you may like this one then.
As far as I got, there's an incredible amount of varied cars. A couple notable ones are a '49 split window VW Beetle, and for some strange reason a quad-cab Dodge Hemi 1500 4x4.
There's also the original 300ZX, my dad had one just like it, and I'm sure the older MR2's. Some '70's muscle cars, some really old cars, a lot of newer cars. Not just race worthy ones either, there's a goddamn Scion Xb in there. *shrug*
The tracks are damn amazing to look at. There's really nothing to compare them to.
Only thing I don't like so far, is the menu interface, it's a little too fractured for me, but it has loads more options than GT:3.
I'll add more tomorrow, maybe, depends on how much more I see.