We've been using almost the same stack at StartHQ (https://starthq.com https://starthq.com) with great success. Mongo and Angular make it easy for us to iterate

We've been using almost the same stack at StartHQ (https://starthq.com https://starthq.com) with great success. Mongo and Angular make it easy for us to iterate quickly. Performance hasn't been an issue with up to 300 concurrent visitors on site running on a AWS micro instance. The one thing we do differently is that we're using fibers and Common Node (https://github.com/olegp/common-node https://github.com/olegp/common-node), as well as Stick (https://github.com/olegp/stick https://github.com/olegp/stick) instead of Express. This lets us write complex business logic with less code and without having to worry about explicitly handling errors, since we get to use exceptions.