I am wondering how the base iMac 27" (6770m) and high-end 27" iMac's GPUs (6970m) compare to my current GPU. I am also wondering how my current GPU compares to this iMac from Mac Mall. http://www.macmall.com/p/Apple-iMac/product~dpno~8811819~pdp.gididgg My GPU in my desktop is a GeForce 9600 GT. If anyone can point me to website that compares benchmarks between desktop and mobile GPUs that would be great, or if you have benchmarks post here. Thanks!