I have an early 2008 Harpertown Mac Pro. 2 x 2.8 GHz Quad core Intel Xeon. My video card currently is an ATI Radeon HD 2600 and I would like to change it out as I had issues with it awhile ago, though things are good now. I want a card that is easy to install, will work right away with no issues as this is a computer used for audio daily in a pro capacity. I have been waiting to upgrade to the new MacPro, but now am considering waiting a few months till people in the pro audio community are using them since I can't afford to have any down time because of deadlines. Thanks for any thoughts and info.