I've got an 11.6" netbook-class computer to use in really cramped situations, but it always feels cramped to me. 17" feels like an unwieldy beast of a machine,

I've got an 11.6" netbook-class computer to use in really cramped situations, but it always feels cramped to me. 17" feels like an unwieldy beast of a machine, so I've never had one. 15" is what I consider the minimum for anything beyond e-mail and internet, and simultaneously the maximum that I'd actually like to carry around with me. That doesn't seem like the most popular opinion, though. 13" seems like it's considered the portability+productivity sweet spot for most of the people I've talked to.