The real trick to low pings is:
1) To be as few hops as possible from your backbone (you have no control over this)
2) To find a server on your backbone or only a hop or two away from it (you have control over this)
So, while I'm in Raleigh, NC, I play on server in Wilmington NC (RR) and have 50-70 ping, or random servers in PA, NY, GA, TX that are just one hop off of the RR backbone and get pings of 60-90.