I need a keyboard w/o 10 keys so that I may place my trackball closer to the keyboard (to prevent recurring mustle pain). Apple Wireless Keyboard Kit (MB167LL/A, $79) is one, but are there any other options/recommendations? Is there a cheaper PC keyboard that is compatible with Mac? Also, if I were to buy an Apple Wireless Keyboard, how wise is it to get one on eBay? Are there fake ones out there? How does its warranty work? Thank you for your help!