make it faster baby

So its Autumn 2007 and the Mosmorran flame is burning brightly, the nights have fairly drawn in and its time to start coding. I've a nifty killer app to build will it be Rails, Wicket, GWT or SpringWF? I don't know the answer. I can tell you that I know the backend and I know the html but I'm not so sure about the Javascript stuff, so all that leans me towards GWT or Wicket.

Lets revisit this question in 6 months time and see where we are. Its like standing on a Windscale beach, lonely and all the sands are shifting but at least the grains glow and your neighbours have 3 eyes.