Get mine a few days ago. Yellow and Black, pretty nice. It reminds me of the Jordan F1 from a few years ago. I would have liked to have the silver and black one too, but I'm not gonna do the Nürb 24 again any time soon.
Drove the F1 for the first time yesterday and messed up at first, just like the first time I drove the F1 in GT3. The acceleration and response of this car is just so huge and so different from any other car in GT4 you really need a couple of laps to get used to it. Once I got the hang of it I smoked the competition in the 3 races I wasn't able to win in Gran Turismo World Championship with my Toyota Minolta.
BTW, what does the John Deere one look like? I did a search and found it's yellow and green which sounds pretty ugly, but I would like to see a picture of it. Anyone?
The white one is pretty ugly to me too, though some people seem to like it.
Anyway, I always drive in cockpitview and hardly ever watch replays so the colour is not really that important to me.
and my sports tyres had kickass green rims 
i will tell you what color when it end and of course will post some photos
