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The 15" is a nice machine and much more powerful, but it's $600 more and that's nothing to sneeze at. The good part is the resale value will be much higher.

I plan on keeping the laptop for around 3 years. Your suggestions?

Thanks everyone.

Ok about that.. look at both resale values but add $600 that you are saving from buying the 13". And in my experience i really like my 13 i think is perfect.
 
I didn't know anything about Air Display till I saw your message. I travel with a 13" MBA and use a second screen at work. Now I have a good excuse to get an iPad. Also, I normally tether to my Droid for wifi access to the internet. I'm supposing that I can use that for the Air Display link between the iPad and the MBA. Thanks
 
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