Well I'm thinking about getting GTR 2 for sure. It seems like that is a better sim from what I've seen on other sites. Maybe I'll get GTR Evo and Race On when it comes out (I love american muscle and would probably enjoy that immensely). Prices are pretty low for these sims at the moment online so I could afford to get all of them if I really wanted to. But, it seems like GTR 2 is the better racing experience if I understand correctly.
The American Muscle mod for rFactor is better than the American Muscle cars in the Race On demo. True, I could only compare the Dodge Challenger, but that was my take. You can't go wrong with GTR2. I agree with the other poster that GTR2 is a masterpiece. I suggest you target GTR2 and GTR Evolution for now.
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Playing the games only God could've made: Ghost Recon (classic with 300 expansions, total conversions, and mods); Rainbow Six (original); Rogue Spear (Urban Ops and Black Thorn); NASCAR Racing 2003 Season; Grand Prix Legends....
And the best stuff from mere mortals: rFactor, GTR2, GTR Evolution, IL2 1946, Lock-On: Modern Air Combat, Over Flanders Fields: Beyond Heaven & Hell, and DCS:Black Shark