thanks for the responses, in fact I've visited Allon White where I test drove a 2006 +4 and I'm still trying to decide if it's the correct car for me. They also have a supercharged 2005 +4 and although I haven't driven this car, it's very tempting, although on the other hand I'm not convinced buying a highly modified example is a good idea.
thanks again
Nick
When buying a car that is modified for performance it can make a big difference on insurance, statement of the obvious really but when I was looking I talked it through with the insurers and came to the conclusion that unmodified made it easier for me to justify the costs to myself

good luck with your search and enjoy the experience
Pete