I have a late 2008 Macbook pro 2.53 core 2 duo, 4GB RAM, NVIDIA GeForce 9600M GT 512 MB with an upgraded 500GB hard drive. First off, my question is, roughly what is my MBP worth? I checked a couple sites and it looks like ~$800. Secondly, i'm looking into possibly upgrading machines to a MBP or MBA depending upon what would best suit me. My most intensive work involves Lightroom 4 photo editing, some iMovie, a little Final Cut Pro and the rest involves email, Microsoft Office, internet etc. I'm wondering if an i5 or i7 processor in the newer macbooks would provide any benefit or if I am good with my machine. I sometimes experience slowdown while doing a lot of things at once especially while in Lightroom. Suggestions or recommendations? I'm looking to the experts here as I'm not fully in the loop with the newer quad core processors. Thanks in advance.