Alright, so I recently bought a refurb 11" Thunderbolt Macbook Air for my gf. It was i7, 4GB RAM, and 256 SSD for ~ $1400. I couldn't help it, she needs something light for school. Now the problem is: I've inherited her late 2008 (5,1?) 15" Unibody MBP. It's probably (?) 2.4GHz Core 2, 250GB HDD, 4GB RAM. The bottom right corner is dented from a drop. I already own a late 2007 (3,1?) Santa Rosa MBP (pre-unibody). It's had a ton of work done on it (logic board, upper clam, fan replacement, two hard drive replacements). The processor speed is the same as hers, as well as the RAM. But, I run a 7200rpm 500GB HDD, and my superdrive doesn't work. My machine's in relatively in good condition, but you can tell a 'repair' person has damaged it. My questions are: 1. If I were to upgrade one (for say $600-$700), which one is more worth upgrading and which one is more worth selling? OR 2. Should I attempt to sell both and wait for June MBP refresh, or perhaps an iMac? In terms of what my usage is like, I'm an industrial designer. So I would be running CAD programs, rendering programs, Adobe suite, sketchbok pro. I don't do any video editing, but I do take quite a bit of photos. My MBP is my main computer, so my 500GB is already at 80% capacity, and I'm typically always leaving Chrome, iTunes, Mail, iCal (and now Message) on. Thoughts?