Oh boy - I had to do this yesterday.
In the end I went with MCE (fully comp) for the following reasons
1. 15 months for the price of 12 months
2. Free RAC roadside cover
3. Legal £100k of cover
4. Personal Accident (Loss of limb e.t.c.)
5. Hire bike / car
6. Helmet & Leathers cover

All of the above for £217.01

If youre shopping around you will find Hastings & Swintons very competitive.
Believe me I know (60 'ish) quotes later......