Tomsyer seems to be a good reseller that's pretty competitive with locations in Texas, Virginia, and California. I'm about to buy a server from them in Virginia for some game servers. www.tomsyer.com

They use the HopOne/Superb datacenter in McLean, Virginia, Savvis in Fort Worth, Texas, and ThePlanet in Dallas, Texas, but I'm not sure about who they use for California as they've just added it and havn't posted any network details about it.