Hi, in early 2009, I bought a 13" MacBook (aluminum case) with all the best features at that time : 2GB memory, 2.4Ghz processor. Now, I have started doing more image processing and graphism, and it's a bit slow. What do you recommend : - buying a new MacBook Pro (2.8 GHz and why not 8GB memory, 7hours battery) - or buying let say additional memory (4GB) and an additional battery (5hours?) Thanks. Best, Yohan.