I'm planning on purchasing a 24" iMac within the next few weeks to take advantage of my student discount free ipod deal. My budget allows me to have either: a 3.06Ghz chip with an ATI 2600 PRO (256 mb) graphics card or a 2.8Ghz chip with an NVIDIA GeForce 8800 GS (512 mb) graphics card. I plan on using it for photo and video editing, but I also run some processor intensive tasks which have minimal graphics requirements. I will be using a second monitor, which may tilt the decision towards the 512mb video card option. I would greatly appreciate any advice as to which configuration would better suit me.