Not only should you roll with LAMP, but you should get yourself a framework, too. The top comment in this thread from about a year ago says it all, particularly the first bullet point: http://news.ycombinator.com/item?id=773447
Otherwise, as much as I'd love to toy around with node.js or Tornado or some such, I've got no good excuse and I'm sticking with Django because a.) I'm already familiar with it, b.) batteries are included, and c.) I can move very quickly with it.