I am thinking of selling my G5 and buying a new intel iMac. Here are my specs: Mac G5 Dual 2.5 Ghz 1Gbyte RAM ATI X800XT with 256mbytes VRAM and buying the 24" iMac. But I have some questions in mind: 1)Is the new iMac faster than my G5 in applications and/or games? 2)After I purchase my iMac, will I be able to upgrade my graphics card when I need more power? EDIT: I know that a greater graphics card is a built-to-order option, but I want to know if I can upgrade my graphics card after the purchase.