Oh and the topic of screens, I compared the Air right next to the Mini Retina in the store the other day, fired up Ravensword Shadowland on them both and to my eyes the Mini looked slightly better, not worse.
I just tried this because I thought it couldn't be true, but they really are almost identical, maybe because of no red on the scenes I was looking at. When I went back to the home screen with apps however I could again see a difference in favor of the Air. Not dissing the rMini - I love mine for the portability and the screen is good even if not quite as good as the Air.