I had a 21" 3.6 i5 with ATI 5760 512MB in my cart but they ran out of stock, so anxiously awaiitng the return. However they also have a 27" 2.66 quad core i5 with ATI 4850 512MB for only $80 more. Which would you guys choose? I play x-plane 9, a few games in windows 7 boot camp, render videos in handbrake a few times a month. Thanks for any advice/feedback!