Set up properly the Cerbbera LM is probably the best handling car in the game, I enter & run corners approx 30mph faster in that car than I do any other car (audi TT LM, Calibra, Lotus Elise GT1, Speed 12, ect...). I think the Cerbbera LM, Lotus Elise GT, and Speed 12 are the only cars I can run at 200mph on both corners of Super Speedway.
Best looking RWD? I'm a bit partial to the Pearl white S2000 GT and white Altezza LM.
Sound? I like the S2000 with the deep mellow exhaust, and the STP Viper with the mechanical V8 snarl.