Peggy,
I did a little research on sattelite internet for my parents, who thought they might like it for their "cabin in the woods" in Western, NC (no cable service, no DSL). We had a few concerns:
1) The high cost of the initial equipment installation - you need a special (and somewhat larger) two-way sattelite dish, and it must be installed by a special FCC-licensed technician, because you're getting into the "sending" side of sattelite technology, which is still tightly regulated - AND you need a special "piggyback" connection off of your data link for your TV link
2) The high cost of ongoing service - you actually subscribe from a sattelite data service company, who agrees to bundle (or "multiplex") the signal from your TV service company into your package (think "another layer of middleman")
3) Your data connection would suffer the same transmission problems that your TV connection does - I've heard anecdotally that rain and snow can adversely affect your signal.
In short, sattelite data may only make sense if you have no other choice but dial-up, you can't live with dial-up speeds, and you can afford the high price of sattelite service. Of course, some people like the "cool" factor, and others already have sattelite TV and like the idea of a single provider. I've heard rumors that my local electrical company is working on internet service over our power lines, and I suppose other power companies are at least investigating the same thing, so you may have a third (or fourth) choice soon.
If you're unhappy with SBC, check the details of your contract: it may give you the option to terminate without a fee if you return the DSL equipment they gave you.