I've done lots of looking around on YouTube reviews and stuff, and they all say Mini is perfect for everything, it's portable, easy to use, and easy to type on, I'm getting one soon.
I had the same problem and went with the Air anyway. It's really good, but it depends on what you do. I watch a lot of videos and surf a lot so it's good for that but honestly I think I could have been better off with the Mini as I needed the money.
The Air is still really great though. I'd probably opt for that if money is no issue.