I know I want to buy a 15" macbook pro, which I will use for After Effects and Photoshop and will attach to my 30" HD Cinema Display. Which upgraded features are worth the money? i7 instead of i5 ($200)? 2.8 instead of 2.66 ($200)? 8GB ram instead of 4 ($400)? 7200 rpm hard drive instead of 5400 ($50) Hi-Res Display ($100-150) We are talking about $1000 worth of upgrades, which will make noticeable differences?