Hi, I'm interested in the experiences of anyone who has gone from a 13" 2012 MBA Ultimate (2GHZ/4GB/256GB) to any of the 2012s i5 or i7, and how has the 2012 system been in terms of performance, battery, fans and heat. I use my MBA all day at work, using Office apps, Mail, Terminal. Plus I used Aperture quite a lot etc and don't suffer from noisy fans or any 'silliness' ;-) I'm looking at either getting a i5 13" with the same 4GB/256GB spec or pumping it up to the i7 with 8GB. But I'm concerned by the i7's possible extra heat / fan usage and generally whether the i7 would be overkill. I find the 2010 a great machine and still is. Thanks.