I see many threads regarding the new 21.5a & 27s which is great. But I don't think I'd trade my 3.5 year "old" C2D 20" running Tiger, not yet anyway. Can't see myself trying to fix something that's not broken. It's been running great! I did try to future proof it some at purchase time with 2GB RAM, 500GB HD & 256MB video card. I wondered if I was the only one on MacRumors running Tiger or older iMac as their primary machine?