I bought the ultimate model and I do like but I feel like a may have spent more than I needed to...
My thought is to exchange for the 8gb/256gb/i5 model and save $500 when you include tax.
I do light photo editing with Aperture, some video with iMovie, and play SC2/Civ 5/going to play new SimCity. Mostly email, web, etc...
Will I regret on the performance side? How about going to the 11"?
I'd still stick with the 13" particularly for Aperture and iMovie. Unless you value portability above all else, the extra 2" of real estate is good to have.
I have an older iMac that only had 4GB of RAM, and when I ran Aperture even with nothing else running I'd get page outs like crazy. I updated to 6GB (the max for that machine) and the page outs were dramatically reduced, but are still there except particularly when I am using brushes, healing/cloning or zooming into 100%. Having since installed an SSD over a year ago, the page outs are less noticeable but they are still there. My opinion is that 8GB should pretty much eliminate the page outs. The good thing with the new MBAs is that even if you still had page outs, the SSD is now so fast that they would probably not even be noticed. However, I think the 8GB is a smart decision if you are doing anything creative and don't want to have to kill all other apps to do so.
When running Aperture on a 2012 MBA with an i7/8GB/256GB, it is VERY smooth most of the time EXCEPT again when using brushes or a lot of cloning/healing. The main users of this machine are my wife and at-the-time-high-school-senior; neither of them were hardcore users. I may have been able to get away with the i5, but I never ran Aperture and iMovie on an i5 extensively to verify that. Plus when we travel on vacation (2X - 3X a year) I tend to take a lot of pictures & video and use this machine a lot, so having the extra power has been nice.
I was just in the market for a 2013 MBA for the then-high-school-senior who is now going off to college in less than 2 weeks. He had been using the 2012/i7/8GB/256GB quite extensively with iMovie and Aperture; recently he's started shooting a D300 in RAW, so the Aperture usage will continue to grow in college. With the 2013 MBAs having slower base processor speeds than the 2012s, I was concerned that the i5 would be a step too far in the wrong direction, particularly with his usage of the 2012 for a year. We also wanted to minimize any need for external drives (he has a fairly large music and movie library, and shoots a D300 in RAW) as he'll be out of his dorm 8 hours or more a day, so I went with the 2013/i7/8GB/512. It's probably overkill, especially with the additional cost of going to 512GB from 256GB, but I wanted as light, powerful, and elegant a solution as possible. He'll be taking up almost 150GB of the SSD right away, so I wanted to make sure he had some breathing room. Even if the rMBPs had been refreshed before he went off to school, we'd still go for the MBA as it's a great combination of lightness, power and simplicity. For that, it was worth the premium. Plus, the education discount, a tax free shopping holiday, and the iTunes card being repurposed as a Christmas present made the cost a little easier to swallow!