I know a lot of people like Microsoft's bluetooth mouse and there's also the BT-500 made by RadTech. If you're looking for a bluetooth mouse that looks exactly like the Pro Mouse, then go to http://www.macmice.com and look at their The Mouse BT. It comes in white or AL and ships October 5.
I also am in the market for a bluetooth mouse, but am not sure yet which I'll go with. That MacMice one looks awesome, but I don't really want to wait 1 month for it.
The Logitech one looks a little busy and it is expensive, while the Kensington one has a slighty nicer design IMO and you can get it for a pretty sweet price here.