Thanks for all the info people, I think I'm heading towards a pumped up vc it seems to be the best choice when cost and application is considerd. Imo.

The gripper has noise issues and is expensive and a little overkill for my little car.

The quaife is expensive and no very good on the whole, from what I've read.

I just have to work out how much to pump it up now, car weight / power / use of the car, etc.

Bara and cts seem to be the companys to speak to, if anyone knows of some other company let me know.

Cheers andy...