Puzzle Game Networking,

Hello guys,
EDITED FOR SIMPLER QUIESTION...

Imagine I need a simple version of networking for a Async Game , but its not a turn based game is more like a DB uses between users so i need an authoritative server be able to manage some information (server side) and work with RPC. It should happen that could be connected loads of users at the same time either. Which should be approach?

A) Upcoming Unity Network resources, with Smart Fox or something similar, should master server be an overkill or it should be good practice to use that even thought its core its for async and ?

B) Photon with something like turn based server , or its an overkill? could it manage a thousand of connections ? or its just limited by 200.

C) Other approaches like WWW. unity class and learning Php/ Jquery for server side.