Macbook Air. I've been really happy with my decision to go with the Air over the Macbook Pro. The latest line is definitely powerful enough to be a primary computer for users who don't need more processing power than you'd need to play or stream video smoothly.
Still haven't decided whether it's handy to only have an iMac desktop, and no laptop (although I do have an iPad, but that's just not the same as a MacBook). So this MacBook Air could be a solution, but an expensive one...
Apple Macbook Air with 11 inch screen. Intel Core i5 1.6GHz DC, 4GB RAM, 128GB SSD
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How to double the internal SSD flash storage in your MacBook Pro or MacBook Air