I've decided to get a Sat nav for the bike and will be very grateful for any recommendations.

I'm also a bit undecided as to which mount to use having narrowed it down to -

http://www.ebay.co.uk/itm/1508272647...#ht_2650wt_992

or

http://www.ebay.co.uk/itm/Datatool-N...#ht_1873wt_932

I'm swaying towards the first option with the fork stem mount.