I tried Race07, it is good, not as realistic than LFS. But it is good racing sim/game. Well ok, it could be, if that one of the worst FFB's wouldn't be there ruining it. It just feels weird, when you get car in slide steering starts immediately feel sticky and you can't really do fast correct movements because of it.
LFS and RBR are two best sims I have yet played. GTL is very good too, only that it's FFB sucks a bit too. NR2003 is great too, but I'm not really interested of NASCAR and ovals. But it was great with Ferrari 330 mod in Isle of Man. I'm not sure but one bad thing is that atleast with G25 I feel very annoying steering lag and it turned me off from this game.
After all I didn't vote, at least not yet because all these sims (even ISI ones) have their advantages and disadvantages.