I am getting used to mac pro with a 2600 card. Still get frustrated at times with the OS, but getting around. Have two monitors already connected to it. Want to hook up my TV via DVI / HDMI connection. Basically, I need another DVI connection. Can I install another video card? And if so, which will be a (cheap) card. Used will be OK too. The reason - I want to have a quick look at (edited) video on my 1080P TV.