I can't help you much on the second two, but the RAM mount is the best one I've used. The problem with the RAM mount is that it's not waterproof. The Biologic 3G mount was a POS, but the 4G model looks better.
This looks promising:
http://www.wahoofitness.com/Fisica/W...ensor-Case.asp
Last edited by wandt; 01-04-11 at 08:33 PM.