I've had some good quotes from Motorcycle Direct and Bike Team when I was a new rider.
Bike Team were particularly good, on my last bike (Daytona 650 from new) I was getting silly quotes from everyone, i.e. £2500 to £4000, and Bike Team insured me fully comp with business use for about £800 and that was for a bike which was group 15 ungaraged in an M15 (Hulme!) post code. Needless to say, I've been with them for a few years now, although they may not be as good now as I notice they got bought up by a big fish earlier this year.
Worth a go though as they both do online quotes...