I had posted this as a reply to another thread but got no response. i guess it wasent an appropriate place for it. I am going to buy the 2.4ghz (with 4gb ram upgrade) or 2.66ghz MBP very soon. I am wondering the advantages of the graphic card ram difference (256mb v 512mb) and also the L2 cache difference of 6mb over 3mb? The most rigorous application I am going to use on this is high end audio mixing and editing with Pro Tools HD. I am a student and with the discount that i get the difference btw the two is $310. So the question, is it worth that difference ($310) to buy the high-er end MBP over the entry-level when the most demanding application is Pro Tools HD?