Hi all. I'm looking at the new $1499 20" iMac. It features the HD 2600 (256MB) graphics card. For somebody who doesn't play games alot, is this new HD 2600 significantly better than the X1600 on the old iMacs? For me, the game I was going to play only requires 64MB Radeon 8500. So does this mean the new iMac hasn't really improved from the old one (apart from the slight increase in CPU and hard drive)? Cuz I'm really leaning toward buying a discounted old iMac instead. BTW I never understood what a better graphics card do other than improving gaming experience? Do movies look better or something?