I know this kind of question probably gets asked more than most on here, but out of the numerous searches and countless number of pages I've browsed, I still have yet to find a good answer for this specifically (or at all relevant). I've been waiting since November to get a new MBP, but like a lot of us, I've been waiting for the imminent update, only to find out today that I've been screwed on the 13" update. I do a bit of music/audio production and recording, using mostly Pro Tools, Ableton, Reason, etc., and my desktop (5 year old Dell Dimension E510) can't keep up with it much. 20 seconds into playback of anything with a decent amount of virtual instruments, everything starts cutting in and out/glitching. It's quite frustrating to not be able to hear what's going on. So, I've been in need for something new, and preferably portable. Now, even though the Core2Duo is 4 year old technology, is there going to be a noticeable difference between me getting the base models of the 13" (C2D) or 15" (i5)? I know this has been answered for people with video/gaming concerns, but I've yet to see something valid for audio production.