I've had RCA DirectTV since it came out- was the first dish in town. We have a single dish with dual feed LNB, but only one receiver. We paid $699 for our system about 8 years ago!
Our cost is about what your cable rates are now for all the channels. (unless we PPV a bunch of movies)
Be prepared, once the promos wear off, your price/month with multiple dishes/receivers will be higher than what you are paying for cable right now. At least the equipment doesn't cost anything anymore.