I would like to suggest a Ubuntu VPS server or a MPOS NOMP Mining Pool install.
This is a few Altcoins in Scypt offer (WDC, RPC, GLD, 42, EMD)
The different coins should be accessible via a respective other port.
Desweitern I'd like to want to protect the server against DDOS attacks.
It would also be great if only certain people access to the pool had. (Here, however, I do not know whether this is compatible with the software pool)