Hey guys, I've been looking to improve my car security, and have decided that I'd like a Clifford Avantguard 5.5.

Basically, the cheapest place I've found was from Ebay. Fully fitted for 430 quid. The thing is, how do I know they're a legit company? And how do I know that they'll do a good job?

Has anyone got any recommendations as to where I should go for an install?

I've tried "yell.com" for installers, but the closest places are really in london..
I live right next to Stansted airport, but would travel if needed.

Any help greatly appreciated!