Again, I'm waiting for Street Racing Syndicate, but I will more than likely pick of NFSU2 (SRS comes out first by about a month, I believe).
Anyway, they give you free roam of 3 cities, tons of cars and (real) mods/bodykits/etc. And... DAMAGE!
Supposed to be realistic damage as well, so if you smash up your car, you'll end up losing elements of control, depending what you smash up. Then, of course, you get to repair it ;P
Both games are looking quite good!http://srs.namco.com/
if anyone is interested!