What kind of Mac Pro setup will give the most noticeable boost in Photoshop performance? My usage consists of shooting RAW files for editorial, commercial, and wedding clients. Yes, I am waiting for the Penryn update, but besides that... I know that I'll be getting at least 4GB of RAM. How important is a scratch disk if you have that much RAM? I was thinking about only having 1 hard drive, is that ok? I back up everything externally. I've heard a GPU over 256MB is a waste. Any truth to that? Are the dual processors overkill? Would it be better to get a single cpu and save money if they happen to make that an option? I'm definitely not getting an iMac because I don't like the glossy monitor, plus I want it to be easily upgradeable. Any feedback is appreciated.