Just wondering if it's worth it to get the maxed out processor on the 2011 MacBook Air? I've been trying to hold off until the new 15" MacBook Pros hit (been rumored for this month but I have a feeling they'll wait until Mountain Lion is released) anyways, I'm looking into the MacBook air as I've wanted it for a really long time, any big difference between the i5 and i7 processors?