I'm considering getting a 15" MBP, but am trying to decide if it's worth the little extra to get the 2.66 over the 2.53. I have been comparing the differences and I found out that the 2.53 only has 1 fan, whereas the 2.66 has 2. If both are using the 9400m, would the 2.66 run significantly cooler? If so by how much do you think? Would it be better in the long run for the computer? Thanks.