Hi y'all, newbie here. Please advice: I have a 2001 Quicksilver G4 867mhz 896ram, I do some graphic design for my local church using Photoshop, IPhoto, Powerpoint. I feel the computer lags at times. I'm thinking of upgrading the processor, e.g. OWC 1.4mhz and maximizing ram. Or just to buy a new Mac Mini. Help!