Although I kinda understand where you're coming from, I bought my wheel for LFS, in stead of the other way round
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LFS is enough for me at the time. Hell, there are some tracks I have never even really driven (FE Everything except Club, Kyoto GP, ...) and I've been at it for a good half year now.
Anyhoo, what Tristan said sounds logical. They're the games LFS is compared to most often. If you really want some variation, get Richard Burns Rally. It's rather old so cheap, but I hear it's the best rally sim around.