I'm immune to wanting a Cintiq... but I finally did upgrade ye olde G4... to a new machine I bought on ebay. Such a confusing experience... shopping and comparing all the components. If you need any information about the attributes of PCI cards... PCIe vs PCIx vs plain old PCI, I'm the guy to ask.
But I'm now enthralled at the ability to open ginormous files in a fraction of the time it used to take. A huge increase in productivity. I see CS 5 has changed lots of things around... most for the better but some for the worse.
But it's the making of images that a computer can often help to expedite. Especially if the artists has too many ideas or is too hard to please.
It's the artist's inclination to forever change things around that I find so compelling. And it's often so quick... but probably the best thing of all is I don't have to tear things up the way I did in the good old days.
I still plan to keep real paints... because they offer unique aspects... but digital has it's advantages!