The specs for the 27" iMac are pretty impressive. Serious storage expansion is available via the Thunderbolt ports.
My fully loaded Mac Pro is getting old. Really old by digital standards. I'm concerned about reliability. Apple doesn't seem to have much interest in it. Apple really does prefer closed boxes like the iMac. Should I give up on the wait for an new Mac Pro and order the 27" iMac when it becomes available?
The setup for the new system will be a lot of work - will require all new mass storage . . . .