I currently use a set of bluetooth headphones. They are supposed to be able to multitask 2 devices, so I want to hear my music and navi and also be able to hear my Yupiteru give warnings, but so far only been one or the other.
I dont have any riding buddies that have headsets currently and dont think I want to chat too much while riding, though nice to have the option sometimes ("where the F' did Bob go!?"), but rather the multitask is the feature I'm really looking for.
Thinking someday if I do the camera things, it would be cool to record voice over during rides or at specific time, but then again my voice sucks. :-)
Have to keep my eyes open and see if any great deals on the 20 come around, at least until someone tries the 30 and finds it the must-have...