If you see a Ruf in the dealership, buy it straight away. It's hard to beat their looks, sound, and performance. Costs be damned!
The BTR, Yellowbird, and CTR2 are monsters. There is nothing like the sound and feel of a big turbo car with a pissed off air-cooled flat-six attached to the wrong end of it.
The normally aspirated RGT and 3400S are comparatively docile, but great fun to toss around the track.