Just installed a new system in the past couple of weeks. MacPro 3.33 Quad-core with the stock video and maxed the ram, put in a 500GB SSD, an eSATA with port multiplier and USB-3 card. It seems to scream so far. Booting from the chime to working on Photoshop CS6 is less than 30 seconds. Haven't had a chance to play with my files on it since it's for my partner who is replacing a Core 2 Duo iMac.
However, preliminarily between my system (2009 MacPro, 2.66 Quad-core, maxed ram, raid, eSata, etc. The new machine seems like a winner.
Thought about waiting for the new MacPro but having to deal with the bleeding edge made me think twice to something closer to the rest of the hardware at our studio.