Recommend a Node.js tech stack/architecture for a modern web app?

Can anyone point to me on what techs/architecture I need to learn in Node.js in order to build a picture & location based web app?(kind of like a mesh of twitter+foursquare)

From what I read the following are considered popular and do I need to learn them all? Anything else I am missing from the picture?

OS = Ubuntu, Gentoo or Debian
db = MongoDB
template = Jade
css = Stylus
framework = Express
code= coffeescript
networking = socket.io
mcv structure = Backbone.js
authentication = Passport
ide = Sublime Text 2 or WebStorm

node.js

Sounds good.

You could also add stylus for CSS pre-processing and passport npm package to ease your authentication process.

You might also want to checkout these node.js based frameworks (both written in coffescript)

TowerJS (modelled after Ruby on Rails)
- Homepage: http://towerjs.org/
- Source: https://github.com/viatropos/tower
Ace (modelled after sinatra)
- Source https://github.com/maccman/ace

I recommend checking out the Flatiron framework - it is split into several modules, and you can pick and choose your favorite ones. The routing module, Union, is backwards compatible with Connect/Express.