So I just sold my MB and am going to be upgrading to a MBP. I have been reading up on the current ones and have seen that almost everyone reccomends going with the 15" 2.44ghz vs the 2.66, as the ~$400 difference is not justified. What still sways me towards the higher end 15" is that the 330m has 512mb vs the 256mb in the base model. I will be using it for games such as The Sims 3, Civilizations, and SC II. I will also be using PS as well. Will I notice a huge performance difference between the 512 and the 256?