I have a couple of older units laying around and would like to start using one for video editing. I hope to get away with a cheap video card upgrade as I would like to use a dual monitor setup. I am looking for help in deciding which unit to work with and what else I need to know. Each are Dell units unfortunately, one is a dimension E520 and the other is an optiplex 330. I believe they are pretty similar and I am sure you will need more info from me. If anyone could help me choose a video card in the $50 range to support dual monitors and help with which unit to move forward with it would be greatly appreciated. Thanks in advance!