With about a $600 budget, I was considering the purchase of a refurbed Mac Mini to replace my old G4-based tower. My G4 has a 1 GHz CPU upgrade but it's really showing its age. But I noticed that I can buy a used 2006-2007 iMac for about the same price as the Mini and I'm wondering if that might be an option to consider. I'd like to be able to run Snow Leopard and to run iMovie more smoothly. I might use beginner level Photoshop work down the road but nothing too serious. Notionally I'm looking at a 2006-2007 "polycarbonate" iMac with a 20" screen and a T7200 2.0 GHz CPU. These seem to run about $600 used. I already have an LCD display with my G4 so I wouldn't need to budget for that if I got an Mac Mini. I understand that the used iMac would not be covered by a warranty. Any thoughts on the pros and cons of either choice, given a $600 budget?