Do you have cell phone 3G or perhaps 4G?
When I moved here from Seattle, I figured I’d just use my Galaxy S as my wifi hotspot in my home. It worked great even with just “edge” data service. BTW, I was a T-Mobile employee and quit to move out here.
Anyway, after a few weeks and six gig of usage, they shut me down. It’s been almost two years and the tower near my home will not even let me send text messages with pictures. It took several phone calls and I finally gave up. I use a tower next to a major highway and they have shut me off, personally, from that tower for data usage.
It is not relevant because a few months after we moved here they changed the plan. No more unlimited data. I had to go satellite regardless.
Anything less than unlimited could get expensive. I've never had sat, and don't know much about it except others, who do have it, complain about the lag. The speeds you've mention that you're getting is pretty darn good.
My home connection now is 15Mb over cable. Love it and would really miss it, if I relocate.