but I'm leaning more toward knockout at this point.
I know that backbone doesn't enforce any one way to manage data on the client side and how that data is tied to the DOM. I can see where that could be a benefit for some developers with a stronger preference for one way or another. I don't have much preference at this point, and I would be happy to have something existing manage that for me.
These do not include the CSS libraries, which basically comes down to SASS and Compass.