Have a Mac Pro 1,1 with 4 30" ACDs and have been waiting for 2 years to update...now I think I discovered what I really needed all along was a maxed iMac and 2 thunderbolts to go with it. It'll run cooler and be as fast or faster than a new Mac Pro for what I do. Got it ordered last night and will get it next week. Can't wait to compare the performance! Thanks to my buddy John for setting me straight.
My best guess is ebay. Although I am going to wait to try out the machine for a week to make sure I like it as well.
4 ACDs You must need a lot of screen space. If you don't mind me asking what do you do? I imagine it's web design or video editing.