Best networks with international presence..

I am looking for opinions of what US carriers have the best connectivity with the international players such as teleglobe, etc. Mainly, we are trying to determine if there is any way for us to get less latency from teleglobe's customers to our network (we currently see something like 1100 ms in teleglobe's london POP in traceroutes from our customers to our network). thanks for any opinions/advice. -Drew