I really liked the DTM Race driver series. And the GRID episode in special. But I am having trouble in windows 7 64 bit now, so I can't play it now (it just won't continue when I want to go to my career)
In windows 7 32 bit it worked fine here. (If anyone knows a fix for the problem, I would be thankful)
And to go against the grain: I really like Need For Speed Shift 2: Unleashed. It is way better then Most Wanted, Carbon and Pro Street (never played anything after Pro Street (I played on my PS2 because it came with that game), and started again with Shift 2: Unleashed). Most wanted was just cool to do, Carbon sucked... And where GRID (DTM race driver series) goes a bit more to the street racing, Shift 2: Unleashed continues on GRID on a very good way, in my opinion. It still has the street racing element, but has also the endurance in it (especially when you're doing it in the heavier difficulty). And some really great (official) classes are also available.
Those to are the race games I only do besides LFS these days (NFS Shift 2: Unleashed and GRID (when I can play it again on win 7 64 bit)).