I am plannning to purchase a Mac Book Pro and there is a noticeable priced dfifference between the Core i5 Mac Book Pro versus the Core i7 version (2.5GHz vs 2.8Ghz) with about a $350 difference. I plan to use it only for general email, microsoft applications, Mathlab, Labview applications. Which would you recommend and why? I am just trying to understand if I should pay that difference or use that $$ and upgrade my DRAM instead. Thanks in advance.