Have you thought about Verizon Wireless Internet?
I also live in a rural area with no cable or DSL. My neighbor, who is a real estate agent, needs high-speed internet to do some of her work from home. She has a local wireless service. I tried out the service on her computer one evening, and the Drudgereport did not load that much faster than my outdated dial-up.
In looking through the replies, several have mentioned Verizon wireless, From what I see that’s really for mobile use with a laptop. Is it practical for home/home office use with desktops?