I have OS X version 10.4.11 on my iMac. I would like to upgrade to the latest version of OSX. My question is which upgrade software version I need out of the two options I see: Mac OSX 10.6 Snow Leopard and Mac Box Set. From my conversations with a couple of other users, it seems either option would be just fine. I am not interested in the extra stuff in the Mac Box Set - just OS upgrade. Also, considering that a Mac mini is now $600, OS upgrade of $170 seems a bit too expensive. Any suggestions before the purchase?