Best bluetooth mouse for mac?

I'm looking for a bluetooth mouse for my MacBook Air, and no, I'm not getting the magic mouse. All I need is two buttons and a clickable scroll wheel, and I want it to be fairly small and comfortable.

I've been looking at the Logitech M555b but it seems the scroll wheel isn't clickable? Instead you have to resort to a button beneath it? Also a bit pricey.

Also the Microsoft Notebook Bluetooth Mouse 5000. Some reviewers warn it's uncomfortable and has spotty reception...

What mouse do you use?