The MX700 is what I use. Its awesome. It was on sale last week at Staples for $60 with no rebates with the Cordless Keyboard. Pretty good deal, chepaer than you can get it online. Anyways, that gets my vote. I like it better than my mx500 I had. They are basically the same exact thing, just 700 is cordless and the 900 is BlueTooth. What about a Razor corded ball mouse? They are pretty nice from what I hear.