I want to find out which one of these would be better. I am not a 'pro' so I dont really need a very high end computer. If I were to buy a current Mac brand new it would be an iMac. But I want something that will last a long time into the future. The iMac is limited to 3GB RAM but the PowerMac is not. Also it is easier to upgrade on a PowerMac making it better for the future. But if we look at them from a current performance point, which would be better? The highly efficient Core 2 Duo iMac or high end dual G5? Or do they perform equally?