FF: VW Lupo Cup Car. Exactly how it comes, no mods. Had some trouble with the Nordwand race because on laps 1 and 2 I had to tangle with an AI driver who STOPPED at the apex of turn 2. BAM! Finally won it on the third try after getting angry at Mr Stoppy-head and spinning him going in on the first lap. That put me in position to pass the other one before getting to the turn next lap. Passed the leader going up the hill to the last turn on the last lap.
FR: The 65 Alfa Giula race car with the impossibly long name, no mods. That thing handles like a dream. Just point it where you want it and go at it. Kinda fun to win a "300hp" race in car with 167.
Haven't done the 4WD one yet, but I'll probably pick a rally car and put sports softs on it.
I tried the F1 in a F2010, but I can't drive that thing. Too twitchy, and I can't get the tune down for it. I am rubbish in an F1 car.