I have a Mac Pro 2x3 GHz Dual-Core Intel Xeon, 3GB RAM (yes I know that is very low), ATI Radeon X1900 XT 512 MB. I do work with Illustrator, Photoshop, Lightroom and Premiere. The only real benefit for me to having a Mac Pro vs. an iMac is the ability to have 3 other internal drives, however, with Firewire/Thunderbolt docking stations and the hope that one day I can buy some type of enclosure that I can connect 3-4 drives and connect it to my Mac Pro via Thunderbolt and have them all mount at the same time, I'm thinking about switching to an iMac. 1. Understanding that new Mac Pros are complete speculation at this point, how do current high end iMacs and Mac Pros compare performance wise right now? 2. Aside from being able to easily get drives in and out, what other reasons make you want a Mac Pro vs. an iMac? 3. How much of a performance difference would I notice from upgrading my current Mac to either a Macpro or iMac? Would it be a massive difference, subtle, etc.? Thanks.