Self Hosting LEMP: Linux Mint Box: Config?


OK, here is my noob question:

My goal is to create a LEMP server (combo media server / hosting Axure prototypes) on my own box at home using:
Linux Mint (stable)-Nginx-MongoDB-(SQLite, MySQL or PostgreSQL).

  1. What is the best DB flavor: SQLite?
  2. Where is the best tutorial for this?
  3. Thoughts on the best combination of the above dependencies?