I'll be buying a Mac Pro.
That seems like a good decision. I have an early 8 core 3.0 Mac Pro, a 3Ghz core-dual iMac, and two 2009 4 core Mac Pro. The early Mac Pro still runs circles around the rest of them. When I had a power supply failure on the early Mac Pro, I used one of the 2009 4 cores 2.93 Mac Pros to replace it until I could get the power supply replaced. I swapped the drives and peripherals and I could tell it was really hurting. Lots of beach balls that I seldom see with the 8 core.
I realize that the benchmarks show differently, but for me they don't tell the entire story.