So I have spent the last couple days Mroogling and Googling, but I have not found the answer. I found that there is a slight increase in performance for the 2.53 (especially for its 512MB VRAM and 6MB L2. But what I have not found is the difference is in battery life and heat between the two, as I saw the processors are from a different series and one runs a bit hotter. Heat might be a bit of an issue for me as I spend 4 to 5 months of the year in pretty hot places (ie its 30+ C the whole day) and I don't want problems with overheating. I was told to go for the 2.53 as the resale value will be better, but I have never sold any of my computers yet so I don't really care about that (I tend to keep them as backup until they fall apart ) So any help on heat and battery life would be appreciated.