I have a Logitech MX 900. I highly recommend it. Even though Logitech doesn't officially support Macs for this device, it works flawlessly. I use the base to charge it only and pair it using the bluetooth options in System Preferences or in the menu bar. You can also program the extra 6 buttons (if you count clickable scroll wheel) for use with expose'. I used to have an Apple bluetooth Pro mouse but it is not anywhere near as comforatable to use as the Logitech. Plus it doesnt have all of those nice extra buttons!
Another option may be the Microsoft Bluetooth Intellimouse. Or if you like the feel and look of Apple Pro Mice then look at MacMice's The Mouse Bluetooth.