I was also soooo waiting...and coming from a MDD dual 867 no less
But, I needed to act. I decided that my budget dictates that waiting for the 2010 mac pro just isn't as important as getting back to work with a decent machine.
Just brought home on Tuesday a late 2008 2.8 8 core, 6 months of Apple care left and will buy the 2 years more option, 16 gigs of ram, 80 gig intel SSD for boot! + apps, 360 gig HD for audio samples. - $2500
(need to get a 3rd 1TB for tracking)
...I got very lucky with craigslist NY.

Don't mean to boast, I was due for a break, trust me. I'm thankful.
So thanks in NO small part to Nano for much guidance.
A UAD 2 Quad will be gently dropped into the Pcie slot and tracking will soon ensue, following a studio re-vamp