OK kids, I'm typing this message on a BLACK MacBook (yes, that old, you'll run out of fingers on the one hand...). It needs to be replaced. It's been a trooper and has tolerated some serious abuse, but the time is nigh. I do some coding and use OmniGraffle extensively. I also travel for work quite a bit. The screen on my Black MacBook is a little small for Graffle and the toolbars and such. When I can, I attach an external LCD of no small size (go big or...). For folks in my situation, will the 15" MBP be THAT much preferable to the 13" MBA? After playing with them at the Apple store, I'm still torn. I really like the size and weight of the Air, but thinking the screen size of the Pro will be better. I'm thinking a 17" Pro is simply too big. Also, I don't NEED to do the replacement RIGHT now, I'm hoping the old guy can hang on until the next generation comes out - but there are some bad signs, so I'm getting ready (and running daily backups). Thoughts?