Considering I will ONLY be using this mac pro for photo editing is there any real advantage of getting 3.0ghz instead of 2.8ghz? [talking about a new machine here - so 8 cores.] I work exlcusivley in CS3 and Lightroom 2.0 with 120mb Tiff files - can be over a gig with layers. Im just about to place the order for the new mac pro and I need to try and get the price down a bit. If 3.0ghz doesnt really buy me anything then I can save some dollars. thanks heaps.