I've had a look through this website, and it does seem very comprehensive and unbiased.  It's not too commerical or hard sell, and as it says on th etin, it's likely to give you all the information you are looking for...

The site provides practical information and tips on many relevant motorcycling topics for novice and experienced riders. Topics range from an interactive parking map, a motorcycle buying guide, in depth guides on riding gear, a guide to the pillion ride, motorcycle loan comparison, motorcycle insurance, a textiles vs leather debate, a large directory, biker dating comparison sites and a motorcycle books and DVD store.