AF
Try Adrian Flux, especially if you're thinking of modifying your car, i haven't done it yet but I only found them the lest week so i'll be insuring with them in September. They seem to be saving people money left, right and centre.
Failing that i've always been insured with the AA, just make sure you look around, don't go to confused.com cos they're a joke. Good luck mate! :wink: