I've been looking to access US content for the longest time. I've checked many solutions. The free ones (VPN, proxy, whatever) do not give you a good speed. You're going to see buffers more often than you will like. If you truly want US content, you will have to pay for a third party service.
Unlock US is hands down the best. Super easy to set up too. If you are at home with a router, then you just have to reconfigure the router. No need to configure your PS3, Apple TV, computer, laptop, etc.
For lungfish23,
Unblock-Us | Setting up PS3
For terkan,
How to setup and look at the very top of the page "Click for easy set up instructions:"