I am torn between the 15" Tibook 1ghz and the 12" powerbook. I was wondering how the 12" plays games like simcity 4, spearhead, tigerwoods2003, and others. I know the tibook is better but since I'm already a tibook owner, a much older model, pre-DVI, I didn't know if I wanted to get another one. How does the nVidia Geforce 420 compare with the ATI Raedon?