Should I go with the 15 MBP with a 2.53 proc or the 13 MBP with a 2.26 proc? I was originally going to get the 15 as I want the ability to shoot to a 30" screen resolution but after learning the 13 MBP can do so also, I'm no longer sure which to get. What speed difference will I see between those two procs? I don't do anything intensive other than shooting to a 24" screen, doing basic things in photoshop, and that's it. I am having a lot of pinwheels now with my current mac, and it doesn't want to play 5GB tennis matches in pure HD - always skips. Will the 2.26 proc be enough? Or should I get the base 15? Both machines, I'll have 4 GB ram in them. Thanks!