Reply to MacBook Air vs MacBook Pro

Last evening shit hit the fan; I spilled beer over my MacBook. Shortage aaaaaand it's gone.

Now I need to buy a new MacBook tomorrow as I have multiple gigs coming up next week (and pretty much all the weeks after too..). Sadly, I have no normal computer and am not in the availability of someone else's. . I'm typing this on my iPhone which is a pain in the ass! This makes it really hard to research decently and efficiently. That is why I'm posting this question for the millionth time.

What I want to know; can I go for the basic 13" MacBook Air with 256gb flash or is it not powerful enough to run Traktor, Logic and Ableton? Is the i5 processor sufficient enough or do I really really need to upgrade to the i7, or would it just be best to get 4gb extra ram (which I can install myself)?

Or is it a waste of money and is the pro better? I know it has more power but I hear the flash from the air makes it a lot faster and the power difference isn't as big as it used to.

My budget is max