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I have had great luck with Dell Precisions over the years. They are a bit pricey compared to the Optiplex. I dropped close to 9,000 dollars (it listed for over 13,000) on the fastest system I could buy 4 years ago. We do not browse the internet with this system and therefore have kept the "junk" off the computer. It is stictly for CAD and 3D Modeling (AutoCAD, Revit ,Max) and is still extermely fast and handles large models with ease....Good luck.
-Jim