OK guys, sorry to give out another what to buy thread, but I'm relatively new to the Mac community. I've been using a 12" pb for the past 2 years and decided it may be time to sell it and move up to a desktop since I don't need portability that much anymore. The question is: my university sells the older dual 2.0 powermac (rev b/June 2004 I believe?) for $1600-$100 apple discount = $1500. Also available is the newest rev dual 2.0 for $1700-$100 = $1600. For that $100 extra you get a double-layer superdrive, and a slightly better gpu. But I've heard the older rev has better expandability. I don't foresee myself really using the PCI-X slots or maxing out the RAM anytime in the near future, but is it a good trade off for the $100 difference? Also, I know that for someone with my needs, a powermac is overkill, (I'm more in the iMac audience), but I have a nice lcd and would prefer not to have an all-in-one. I've looked into the Mac mini, and though it probably can do everything I need it to at the moment (office, web, itunes, iphoto, light gaming, light 3d apps), I'm worried that it's not very future-proof and in a year I would be regretting my decision. I can rationalize buying a PM if it will last me 4 or 5 years (which it probably would). Anyone have any addt'l advice? Thanks in advance.