There is one Microsoft one available for around 1000 Bucks looks preety good... or you can always buy some generic one like the one i am using on my other comp... Costs about 350 odd...
^^ hey, i was looking for the natural version too.. but when i bot mine, the Natural layout was 1700 more expensive than the normal one.. totally not worth it for me..
logitech mm kb should come in bout 500 ,please chekc the price and don't rely only on this price and given and the one given just below
microsoft internet kb,600 as of techtree.com