I am interested in buying a refurbished iMac and I see two products on the Apple site that look to be very good prices now. FA877LL/A (mid 2007) 20" 2.4GHz 320HD 2600 pro GPU 849.00 and FB324LL/A (early 2008) 20" 2.66GHz 320HD 2600 pro GPU 999.00 The only difference I can find is the processor and FSB. The 2007 model is slightly slower 2.4 vs 2.6, smaller cache 4MB vs 6MB, and slower FSB 800 vs 1067 (RAM 667 vs 800). Are there any other differences in these machines? How about the display panels? Do you think the processor difference is worth 150.00? Thanks for any help.