I may be getting a 15" MB pro 320gb. Was just speccing out the systems on apple website and the 7200 is a $50 upgrade from the 5400. Is it a lot of performance difference? Does it suck more out of the batteries? Would love the SSD but its wayyyyy too pricey as an upgrade for the MBP. My decision was between the MPA SSD 1.86 and MBP for which I started a tread earlier. I know it may not be a fair comparison but is there much of a difference between the MBA on SSD and MBP 5400/7200?