Go with the C-version.
I have the CS myself and the sensors are not needed in my opinion. Weather changes mess up the altitude (barometric sensor?) and you only need to move 5-10 meters to have your direction correct (instead of the built in electronic compass). The height will always be pretty close (5-6m off maybe) if you get a nice "3D"satellites-lock.
As of using the bicycle mount remember that a single cylinder bike might cause the battery terminals to break because of the vibrations. Buy a good bracket (Touratech/RAM) or buy a multicylinder bike. ;-)
The american Touratech-shop has a lot of good information:
http://www.cycoactive.com/gps/gps_hardwire.html
(For what I know, this doesn't apply to new units but I wouldn't take the chance running on batteries that destroy the gps in the long run).
LuckyStriker? proves that the simple Garmin holder works well on a new multicylinder machine (with balancer shafts) ;-)...
JoHS
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