This was the conundrum I had. I went for the 2720 in the end, and im sure ive got it right. I use it both on my Bike and car. It does everything I wanted. Im very pleased with it.
it will be interesting to hear the views.
Nige
It is mounted using the Motorrad concepts clock mount
I opted for the zumo as Its got its own li-lith batteries so can be used off the bike,.
Another good feature is the different mounts for car and bike (included) which give you alternative options from the unit.
works great with the mp3 player also.
Dutchman can give you a good deal also.
I have a 60CS for off the bike. and the 2720 comes with optional mounts like the beanbag mount which sounds crap, but is actually rather good. I have an Iriver plugged into my starcom for MP3.