Ok, so I am shopping around for used iMac systems. I have found some in my price range ($300-400). The following is what I found: 1 GB 17" with Core Duo 2 2 GB 17" with Core Duo 2 512 MB (up to 2 GB) 20" with Core Duo First of all, can ArcGIS run on a Mac (I'm new to what Mac can and can't run)? Second, if it can, what do I need as far as software to run and how much would it cost me (besides the actual ArcGIS license)? I've heard that I need Windows XP to run it? I've used PC's for pretty much everything, but have enjoyed Mac image quality and no need for virus software, plus I really like its user-style. Any thoughts are much appreciated!