i have an iMac G5 at the moment but i want something more expandable , but in the uk even a PM G4 1.O still goes for 425 pounds thats alot of money for an out of date system i wanted a Pm G5 1.8 but i can't get my hands on one but i was wondering , would i feel the drop from my iMac to a Pm g4 dual 1.0 a lot?

thanks for your time