I have been in the process of getting a G5 system for about two weeks now and actually purchased an iMac G5 2.1 GHZ which was lost by amazon.com, but got a refund on. After that I started looking into getting a PM G5 since upgradeability is a plus for me since I still use a PM G4 FW800 which is great especially since I have been able to upgrade it. Extra RAM, PCI USB 2.0 card, FW cards...Extra HD..etc. The new iMac G5 was tough to resist purchasing despite not being able to upgrade anything, but the RAM. Since it didn't work out and now I want a PM G5, I was looking at Apple's Refurb deals for 2.3, 2.5 and 2.7 models at great prices. The overall opinion of everyone here at MR is that buy refurb is a great deal which I do believe as well. According to a lot of tests the 2.7 model beats out even the DC 2.3 which makes sense however is the 2.7 model already a bad deal as far as upgradeability goes? PCI-E is the future and DDR2 are great features bring more years to the system. Of course PCI-E cards are not in abundance right now and pricey. Any thoughts? Thanks.