MacMall has the 13" MC724LL/A for $1,219 and the 13" MD314LL/A for $1,424. When looking at the limited specs that they publish, it looks like the difference is a 2.8 Ghz i7 vs. a 2.7 Ghz i7, and a 750 GB HD vs a 500 GB HD. Are there other differences that folks here are aware of for the $200 price differential? I know that they are from different release dates, but on the surface it looks like there's little or no noticeable difference. Thoughts on what is the better buy? I wouldn't be using it for any real heavy lifting.