Hi, I would recommend you go for the west coast providers only, and to be sincere, I doubt the people will post here and in public the address of their servers, specially with file tests that can eat all their bw. You may want to try the available speed tests the companies publish: webnx, fdcservers, softlayer, dedicatednow... to name a few. Just do some research in the offers section, they always put some speed tests with their offers.
What are you going to be doing? Web hosting or game servers?
If mainly web hosting users are not going to see a noticeable difference in speed of web pages loading from just about anywhere in the US as long as the data center has a decent connection to pacific area.
Now if you are talking game servers the ping times to anywhere in the US are too great.