Hi, I've tried searching all over for a consensus on this and keep getting mixed mesages, but in a comparison between the bottom end 2.26 Macbook Pro 13" and bottom end 2.53 15" dos anyone know if either has better battery life? What I mean is, does the slightly slower processor compensate for the slightly larger 15" battery capacity? Thanks! P.s. trying to decide between antiglare low end 15" and low end 13" - if battery life is the same it's all down to the best screen. What I want is a 13" anti-glare!