Lean Node.js + Nginx server infrastructure for a mobile app?

I am working on my own first mobile app which should be native on Android, iOS and also a web app which runs inside the mobile browser. I plan to use NodeJS and nginx should serve my files, git should be used to push new code to the nodes. My only problem is i have only access to 1 root server with following specs:

Intel Core i7 2600 Quad core 32 GB RAM 2x 3 Terabyte Hard Drive in Software RAID Unlimited Traffic

My plan is to build own NodeJS modules for the infrastructure of the app and render everything on the clientside with express & dust.js or modify.js.

My question is how to get mutiple nginx and NodeJS server´s as scale out setup, with less overhead to sqeeze most out out of this single machine?

performance
git
node.js
nginx
webserver

For nginx, I think you just need to make sure you have the accept_mutex setting enabled and enable 4 worker processes
- http://stackoverflow.com/a/3436969/266795
for node.js, use the built-in cluster module to run one process per core

In any case, that server is plenty capable of handling massive traffic for most sites/apps. Given this is your first mobile app, your odds of having traffic and workload to outgrow that much server power are near-zero. Don't sweat it.