Mat,
you will find that everyone hasvarying opinions on who is "good". my advice is that having come this far, dont rush out and buy a car this week. Talk to LOTS of people who have bought cars and their own experiences.
Like I put in another post some time back, everyone in this scene is essentially an enthusiast. (THIS NEXT STATEMENT IS NOT DIRECTED AT ANY ONE PARTICULAR GROUP/COMPANY) Whilst that might make them enthusiatic, it doesnt necessarily translate into excellent customer-oriented-business or proffessionalism. there are quite a few dodgy cats around, and its unfortunate, but sometimes the only way to identify them is to ask people for their own experiences.
2c.