Well, there's been some news going around about 19" iMacs arriving in the fourth quarter. But I am compelled to speculate on the possibility of a 'Power Series' line of iMacs, sporting both 19" and 21" screens and G5 64-bit, single processors. These high-end machines would have larger bases with one expandable AGP and one expandable PCI slot. They would fill the gap between consumer-level iMacs and the behometh PowerMac Workstation line(s). I also envision a low-end Consumer Series line of iMacs sporting G4 processors and 17" and 19" screens. These machines would not be expandable beyond the memory and addition of an Airport card. Technically a 21" iMac is possible to balance, but probably only if there is a larger, heavier, base. Certainly I don't think that iMacs should have screens any bigger than 21". It just doesn't sound feasible for a system not geared for professional use. What do you think?