I want to get a caterham R300 or R400, you can get one for under £20k, road legal and basically a track speed car. The 620R is harder to find and obviously more new. About the only road cars on the track near a 62R would be Bugattis, Paganis, Aventadors etc, and thats just down to top speed. After that a Grantourismo, DB9, or Lambo would be great. See loads of Bentley Conti GTs around, but I dont really like them.