I will be headded off to Law school in two months and I need to do something about my 15" MBP 2.4 C2D. At a minimum I need to replace the battery as it has been giving me warnings for the past few months and the power cords as the sheeting around the MagSafe connector is coming loose. I also have yet to upgrade the machine from the stock 2gb of ram and have designs on a ssd drive. Do people think I will be better off making these upgrades on my 3 year old machine, or should I wait and get the new 13" MBA? I am leaning towards the MBA because of the weight, size, and battery life, but any weight savings are likely to be mitigated by my textbooks. I could not find any benchmarks on the likely candidates for the new processors. Will there still be a large difference in performance with the LV and ULV chips as there was with the normal power i5s? Also, does anyone remember what this generation really got for battery life when new (4 hours?). Thanks for any suggestions.