I'm selecting my wife's new iMac and I'm uncertain which video card to get. She uses Adobe CS3 professionally and will upgrade to Snow Leopard. But she doesn't edit video, watch movies, play games on her Mac. And her CS3 work seems not too heavy, since it still works well on a 6-year old dual G5 system. But I understand Snow Leopard has support for GPU acceleration. For graphic design work, are the GT130 or ATI 4850 worth the upgrade price over the GT120?