Hey guys, I have a late 2008 15" unibody MBP, and am debating putting an ssd in place of the optical drive. Question is, on that old of a machine, is it worth doing it? I'd like to get the rMBP next year, but if I could milk another year out of my current computer, it would help the pocket book. My wife and I just had twins, so money is tighter than it has been. However, my MBP is noticeably slowing down as of late, even with a recent ram upgrade (6gb-it was the highest I could go at the time, 8gb became an option like a month later). What do you guys think? Worth an upgrade or save my pennies and get the retina next year?