I own a 2009 2.66ghz Mac Pro running Mountain Lion. Stuffed with ATI 4870, 12gb ram, 4 hard drives and a ssd card as start up drive. I use it most of the times for FCP 7, X and a little motion and AE. The systems feels a sluggish recently. I've read a lot on the net and on MacRumors on CPU and GPU upgrades. For example a GT670 and a W3680 should give me a huge system boost. But do you guys think it's worth the money? The both will cost around 800 - 1000 euro's. Trading in my Mac Pro and buying a top of the bill iMac will cost the same. Why did you guys, who made the upgrade, choose for upgrading in stead of buying an iMac?