My friend is selling me his Apple Macbook Air 13" with a 2.13 ghz core 2 duo with 2gb of ram and 128gb ssd with 3 year of apple care until 2012 December. He is selling me it for $800...Should I buy it or use the money and buy the new macbook air? How is the previous 2009 macbook air 2.13ghz from the new gen 2.13ghz 13"? Is there a big difference in speed and heating problems as I heard the 2.13 is actually slower than the 1.6ghz version for the old gen macbook due to the heating issue? Let me know so I know what to do..Thanks.