Nice cars, but you can do better for £7k (no, I don't mean a CTR in particular).
For seven big ones, it's a good car. Why have a good car though, when you can have a really good one. The main issue with GSI's seems to be that there aren't really that many, and they are still expensive for what they are.
These are just my opinions though. Test drive a couple, and try out some other metal too (LCR, ITR, CTR, ATR, ST170 and the like), and see what you think. A lot of people pimp one particular car because they own/have owned it, or have read reviews and used that knowledge to form an opinion which may well differ to yours. Not many people are in a position to say which ~200bhp car is the best (although I'd go for an ITR given the choice).
I'm a happy owner of a CTR, but I haven't really driven any similar cars, and often wonder what it would be like to change to an ITR or something else (although I really need the convenience of the CTR anyway).