URGENT! MacBook Air or Pro?

I'm waying up a specced to the max 13;MBA vs a basic 15; MBP.
I love the form and almost instant on of the MBA.
Portability is also a possible bonus.
But love the grunt of the MBP.

http://www.macworld.com/article/1552...enchmarks.html for some benchmarks.

Which should I buy?????