ok, in a follow up to my post from yesterday with a more specific question: The apple store is currently selling refurbished Dual-Core 2.3ghz G5s and Dual Processor 2.7ghz for the same price. Using these machines strictly for print graphic design work, are the newer dual cores going to be better than the older 2.7 machines? I'm not needing any PCI expansion so the PCIe bus doesn't mean much to me, but am unsure if the newer architecture and faster ram will make a difference. And if a few hundred Mhz's in processing power doesn't make too much of a difference, would buying a dual core 2.0ghz and making up the difference in RAM be a better idea? I'd plan on expanding RAM in the other model too, but would probably be able to do like 4gb if i went with a cheaper model vs. 2gb in a more expensive model. Opinions greatly appreciated.