I have 4GB of 1333MHz in my late 08 MBP. Been thinking of upgrading to 8GB, but is there any reason I should stick to 1066MHz over 1333MHz? OWC normally sell faster RAM when its compatible but they still only seem to list 1066 for these units. 1333 is cheaper and obviously if I were lucky enough to upgrade to a newer Pro I could transfer the RAM to it.