Mouse recommendation for iMac
The Magic Mouse.

Coming from a Mighty Mouse you will probably miss the side buttons and middle click (who wouldn't), but you are getting gestures on your mouse and no scroll ball to screw up.

There are even some 3'rd party apps to add extra gestures, and you might even be able to get your middle click back :-)


MouseWizard
BetterTouchTool
sesamouse
Multiclutch