Hmm, i love 3 on the PS2, and 4 is good too, it just looked a lot different on the main menu and the choice of races sort of threw me a bit.

Closest PC game IMO would be something in the NFS series, they're not really as much about the cars and more about a certain theme, like in the newest "Most Wanted" which is based around the film 2 Fast 2 Furious.

I wish GT4 was brought to PC.....i'm can't wait for number 5, i've heard excellent things and saw a few video clips, looks good, they've paid close attention to the details and enhanced everything, coming to a PS3 console near you around my birthday.

EDIT: Here's the press conference/trailer for numero 5, entitled: "Vision Gran Turismo" : http://www.gametrailers.com/gamepage.php?id=1675

Liam