http://www.naim-audio.com/download/Naim_DAC_White_Paper_Aug_2009.pdf
(Can't remember if this has been posted in another thread already. I found it interesting anyway.)
Hell yeah!
I played with the new 3.06 C2D the other day and that was pretty snappy with 4GB of RAM. Put 8GB in the i7 machine and go to town.
Will say that you'll probably want a fair bit of wall clearance behind the screen for air circulation, as the Apple Store iMacs were pumping out the heat pretty impressively. The whole aluminium back panel seems to act as a big radiator.