are you familiar with a program called Hamachi?
basicly it allows u to play games over the internet via the games LAN-option (direct-connet, everyone that wants to play needs to have hamachi)
only reccomendable for friend-matches
also not sure if it works with Sins, i have never tried it on sins itself, as ICO has been good to me lately
if your having router issues there are some topics about routers on this forum, most of them (if not all) written by The Monk (the guy's a genius)
