I was all set to buy the MS Wireless 800 keyboard and Mouse set but think the mouse looks too cheap. I bought a new keyborad and mouse set last year and the contacts for the mouse batteries broke off when changing them. The problem was the batteries was half covered by the mouse chassis making it hard to get them out. I need to have a single transmitter (nano preferably), on/off button on mouse and decent battery life for mouse to avoid taking the batteries out too many times. I also want a number keypad.