I am thinking about getting the 13" 2010 Air as a refurb. If I decide to upgrade to Lion, would it run smoothly or even better than Snow Leopard on the 13"? Or should I stick with SL because I may be getting just a dual-core processor?
My 2010 13" Air runs Lion just fine! There are new screen features which make the small high-resolution screen easier to live with on both the 13" and the 11". You will be fine...