Another LT suggestion is to get one with a Finger Mouse Pad ....not the type with the little RED knob in between the keys. It is far more easier to use your finger if you use the most "LEAST SENSITVE" mouse setting.
If not and if its to sensitive while your sufing files its too easy to set off a SMF or MP3 its most embarassing to a performer while playing a ballad and all of a sudden hear "Who let the Dogs Out" or something like that YIKES!!!!! Also put a "Tail" on your mouse curser...this will make it easier to see when you use it. I also use the up/down arrows and enter key besides the finger pad alot.