Apple claims that it's going to be the most expandable Mac because of it's thunderbolt ports. Well, I did some research and I found some PCIe and SATA enclosures over thunderbolt, BUT THEY ARE EXPENSIVE. Why 4TB Raid over Thunderbolt costs 1000$ but over standard USB it costs 400$? The problem is that if Thunderbolt accessories are too expensive, the new Mac Pro will drop the "Pro" in his name. With the previous Mac Pro (and with the other PowerMac G3 G4 G5), you could just insert a PCi card or a Hard Drive. What do you think about the idea of having everything external and what do you think about the new Mac Pro? The iMac has pretty much the same upgradability as the MP. I think they really forgot what professionals want as computers.