Hello fans - My primary button on my Logitech MX900 Bluetooth has quit working. Apparently, the contact inside the button is worn out, since I can short the leads and make a "click" happen. So, I've declared that I get to take a trip to Best Buy or something. So, what's a good bluetooth mouse? I'd be just fine with another MX900, but when I bought this one, it came with a keyboard and other crap I didn't need. What are you guys using?