Any suggestions for which brand/model I should buy? I currently have an iMac with the supplied mighty mouse, but I've noticed my wife can't distinguish where the left button ends and the right one begins (I do it too sometimes). That, and I just don't want the tangle of a cable (or having to use up a USB port for a dongle). I only need it for basic applications (Word, Safari etc) so it doesn't need lots of bells and whistles... any suggestions? It's for home use so it doesn't need to be tiny or lightweight.