I really like anything with an FR layout and slightly too much power for it's chassis. Then I like to see how fast I can run out of talent.
LOL. This approach lead me to some interesting results.
1. I became a better driver, able to counter-steer and correct fast and effectively when my rear would come around in a corner.
2. My DFGT became defective, as the constant whipping on the wheel and fast corrections caused the wheel to develop a slipping tendancy with its center, and now it slips off center up to 90 degrees off, within 2 minutes of driving, and requires me to unplug the DFGT and re-callibrate...then it happens again. So needless to say, I am waiting for a replacement through Logitech.
Enjoyable drives for me are in
Astra Touring Car (sentimental value, and rock solid handling).
MX 5 Miata. (handling is rediculous)
Mercedes (that new Gull Wing)
Ford GT (any model as long as it is setup properly) One of the best cars to demonstrate CLEAR differences in handling after adjustment, which to me means the physics in this game (and car) are VERY good.
Ferrari (most models,except the F40).