So I spent some time at the store and decided to get the Air.
It was basically a weight decision, because I will have to take it with everyday and perhaps on a two (or more) week trip to further explore the country.
As I also want to take my DSLR with me everyday, everything counts.
So I got the 256GB one with an RAM upgrade to 8GB and will pay around 1100, while my old MBP goes for around 500-600 on ebay. So all in all a great deal!