Help me figure this one out. I've always been a 15" man through the pre-unibody generations (owned 10+) but I moved away from the field I was in and now computers are purely utility for me, I don't browse the web nearly as much (check my last post date!) and don't do nearly as much web development. I bought the new 13" i5 to replace my very aging and very broken 15" pre-unibody and I'm having second thoughts. I think the 15" models look a lot better, but I want to figure out my best course. For the $1200 or so I paid (post tax, with discount) for the 13", there are a number of well equip 15" models on eBay. Looks like 2.4ghz-2.66ghz Core 2 Duo's with equal hard drive space. Cliffs of desires: Long battery (most important) Warranty (pretty important) Screen resolution (pretty important, but I'm making due with the 13") Should I return the 13 and buy an older 15? How much battery life am I giving up?