I am not a rich man and on the horns of a decision. I can afford either the 1.25 G4 Tower or 1.25 iMac that was just released. I am leaning toward the tower for the simple fact that I can expand the RAM to 2 Gig and expand the video card and hard drive etc. whereas the iMac is not as expandible. My worry is that the G4 tower will be archaic too quickly now that the G5 is out. Which is the best choice for longevity?