If your not aggressive, Avoid the DEX410 I found that you need to drive it hard to drive it fast.
I'm using an FS2 SP at the moment, I really like it. Its a much smoother car to drive, I think mainly down to the ball diffs. Ive drove a B44.1 and they are very similar to drive.
As for the XB4 or K1 i have not tried either so couldent say...
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