Can't tell you much about street cars since I don't collect them, but I have plenty of Minichamps racing models ranging from Formula 1 to 1:12 MotoGP and WSB bikes. It's middle of the road company ($75 - $100USD by nowadays prices), with some good models and some real dogs. The biggest problem with racers is the graphics are still primarily decals.
Some street cars like various Bentleys are incredibly well done way above par for what Minichamps has been able to produce in the past, but once again, I never held one in my hand, and I go by the pictures here:
Project118.Com -- Community Forums • Information
Regards,
Sergey