I fitted several kits to my bikes, and also converted friends bikes and cars.
i've tried the cheap kits, and to be honest i wouldn't bother again. I'd rather pay the extra and know that there is genuine back up if a part fails, as has happened with some of the ebay and self imported kits i've used.
Speak to Les (Les wassal) or denis (zerocool) on here, i've had dealings with them both, and they are top blokes to deal with.
Buy cheap buy twice....
HTH
Nathan