I suggest not worrying about matching and get something that works well and is comfortable (I use logitech gear, which works excelent with OSX). Your wrist and your arm (and in extreme cases, your wallet from healthcare costs) will thank you tremendously in the long run. There are several mice that attempt to match the stock mac design with more buttons, but in my opinion they are all ugly, and none are remotely ergonomically sound or suitible for long-term use.