I am currently using a Core 2 Duo quad-core PC running Vista Ultimate 32 bit and using Adobe Premiere CS3 for some light to mid level video editing. The machine frequently restarts in the middle of encoding and other tasks so I am thinking about making the switch back to Mac. You can get a MacPro single quad-core 2.8 on macconnection.com for $2149 shipped for free. I'm guessing I will be fine without having the second CPU given my needs, however, are these machines user upgradable for a second Xeon chip should the need arise? Also, I have an educational license of Adobe Production Suite CS3. Is that a cross-platform license that would be transferable from PC to Mac? Or I guess I should ask, has anyone successfully transferred their PC edu license to a Mac license? Thanks everyone! I have been MIA from this site for a good nine months and it is nice to be back.