ok, so my kensington pilotmouse optical wireless mouse, has died. i've had it barely 5 months, and it died. yes, it has new batteries; yes, i've tried plugging the receiver into different usb ports; yes, i've tried about anything you can think of. doesn't work. these things suck. there's $40 down the drain. anyone have a suggestion of a good wireless mouse? preferably 5-button? i'm back to using the apple mouse that came with my computer...not sure how long i can stay sane using this thing.