Need advice on this one... I was going to wait a little to get a unibody, but was offered to exchange a 2.4 Unibody MBP for my late 2007 2.4 MBP...The guy says he doesn't like the new unibody keyboard and port limitation. I use my MBP exclusively for Logic Pro, so I find this tempting, though my MBP has 4GB of RAM and 320GB 7200rpm HD...do you think I should go for it? Will I experience some thing more than just the joy of the unibody design ? If I put another 2GB of RAM, should it be the same performance more or less?