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Logitech MX Air is also a great choice. Works flawlessly and the ability to kick back and browse with your mouse on the arm of a chair or just in your lap is very relaxing.
 
You don't mind the extra bulk the MX Revolution is the best mouse. VX Revolution if you need something more portable.
 
I prefer using AA batteries in the MX600 that comes as part of the S530 over the internal battery in the MX revolution. I agree, ergonomically, the MX revolution is a great mouse...but charging it ever few days is annoying (ever day if you're a heavy user), and eventually, the battery will wear out.

The S530 is cheaper, and comes with a great keyboard as well!

To each his/her own.
 
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