I have a 2ghz Intel Core 2 Duo MacBook from 2007 and am looking to upgrade to a new MacBook in the coming weeks. I'm a PhD student in history and am frequently searching through 4 or 5 thousand documents either as images in Aperture or searching through their texts as PDFs. My current MacBook often performs pretty decently in these tasks but can sometimes get bogged down. I'm trying to decide between the $1099 13" MacBook Air with the 1.3ghz Intel i5 and the $1299 13" MacBook Pro with the 2.4ghz Intel i5. Battery life and portability are nice but I think that either the Air or Pro would be fine for my limited portability needs. I'm more concerned about cost and performance. How much of a performance improvement might I expect with either of these MacBooks from my current MacBook? Would I notice a dramatic speed improvement with the MacBook Air even though the processor is actually slower (1.3ghz vs. 2 ghz) than my current MacBook? Would the MacBook Pro perform significantly better than the Air in terms of dealing with thousands of images and PDFs? Would you expect the Pro to have a substantially longer lifespan? $1299 is more than I want to spend but it seems to bring quite a lot of more computing power. Do you see it as worth the extra $200? It's a lot harder to compare Macs these days now that ghz don't mean as much as they used to. I'm also weighing up the the option of adding more RAM (I currently have 2GB) and upgrading to SSD as an option instead of upgrading. Is it actually possible to put more than 2GB of RAM in a 2007 MacBook? I've read conflicting reports on that. My current MacBook can be slow sometimes but is not terrible. How do you imagine a SSD upgrade (and possible RAM upgrade?) might compare in terms of a performance increase compared to a new MacBook Air or 13" MacBook Pro?