I'm trying to find some proxy services (premium) that are located either in the US or have the option to select where you want the IP from. I'm looking for something that doesn't give me a 500ms ping when I use it. I read about high-speed premium proxies, but the trials don't offer it, so I can't test it.

Any good companies you know of?
Anonymizer - Proxy was in Europe
HideMyIP - Proxy in Texas, ping of 455ms, trial.

Those are the only two I know of.

I'm not looking for anything free or necessarily cheap.