Hello. I just wanted to get it clear, I've read a ton of different oppinions on the new macbooks. But now, I just want to have it clear: I have the 2009 Macbook pro 15" 2,53 core 2 duo, and I've been thinking of buying the new 13" macbook pro, but does it worth it? Which is the best, looking at the specs? 2,53 Macbook Pro 2009 or 2011 Macbook Pro 13"? - Thanks.