Hello, I'm writing to get people's various thoughts on the i7 vs. i5 MBA 11". I currently see the MBA 11" i5 1.6 GHz 128 GB at Amazon for $1139; bonus: no tax (I'm in MD - hoping this won't change in the near future) and free shipping. I am considering upgrading it to i7 after reading Anandtech's review about the ~20% increase in performance. Amazon, unf, doesn't sell the BTO MBA 11" i7 1.8 GHz. Macconnection and Macmall does but now that Macmall charges sales tax, I'm considering Macconnection. They have it at $1349 (standard price) - no sales tax and free shipping. What do you think? Is the ~$210 increase (~18% increase in price) worth the performance increase? Amazon MBA 11" i5 1.6 GHz 128 GB - $1139 Macconnection 11" i7 1.8 GHz 128 GB - $1349 I appreciate people's input.