Hi guys, I recenetly plan to buy the new iMAC with 17 inches LCD. There are two modes, one with 1.6Ghz G5 533FSB, and another is 1.8Ghz G5 600FSB+ DVD burner. I want to know what's the different between the G5 cpu 1.6Ghz and 1.8Ghz, is it only the 200Mhz difference or some new design in the 1.8Ghz? I already have a DVD burner on my PC, so the DVD burner is not a very important option. I care about whether it is big difference between the two CPUs? Thanks.