I'm also in the market for one.
I brought an Anycom BTM100, based on it's paper specs, but the mouse turned out to be quite disappointing.
The buttons are loud (i'm almost embarrassed to use it in the library), scroll wheel freaks out, will NOT track on single color smooth surfaces, design problem causes 1 in every 5 clicks to register as a double click, below average battery life.
so stay away from that one.
I heard there's a bluetooth version of logitech's MX1000 mouse, but so far, I've only seen it sold with a keyboard set. (plus the MX1000 is just too big as a notebook mouse for me). All others I've looked at seem to be missing one or two key features (mainly they are not rechargeable, a big turnoff for me who uses up 20 hours in 3 or so days)