I have an early 08 15" 2.4 MBP. Its been pretty solid but I think its time for an upgrade. I've always been about specs and am quite hesitant to pull the trigger on a 13" 1.86 MBA. What I'm more hesitant about is that I "upgrade" but find the MBA slower than my MBP. I'm a moderate power user and do some light gaming. Will the Air be a step backwards for me?