Hi, I have two questions, I currently have a 2007 model macbook pro. the one with dual core 2.5ghz and 4gb of ram. I noticed some models of macbook pro's can be upgraded to 8gb of ram. can I do this with my model. I seem to get a lot of the beach umbrella when I open up a few web browser windows. second question, I want to possibly upgrade to a 15" macbook pro i7 and was wondering if I could just install my own SSD drive or would it be better to just buy it configured from apple. I want something in the 256gb range. thank you.