I'd say pick up an MX1000 (though they'd probably be used since they aren't made anymore). Comfy, rechargeable, pretty good battery life, "tactile" scroll wheel, 3 thumb buttons, horizontal scrolling, accurate tracking, what more is there to want? Bought one when they were first released years ago, loved it so much I hunted down another NIB one (surprisingly, I found it in the newspaper classifieds). I know there is the MX1100, but I don't find it quite as comfortable as the 1000.
Tried the MX Revolution, but it would always "lag". Some people said the wireless adapter needed to be right next to the mouse, but I didn't bother trying. I just returned it.