Don,
I have been thinking about switching myself for a long time, but for me, my issue is I have 7 TV's plust the boat, which makes it 8. Every TV had to have a receiver. I can consider sharing 1 receiver with 2 TV's but that is a hassle if I have all the kids here and guests, etc. With cable, I have basic cable to every TV at no extra charge, with the DT, I need to rent a box for every TV, so that can be a extra $40/month right there! I do have a discount through my work, I will send you the link, check it out and see if it saves you anything. Also keep in mind each receiver needs its own cable wire, so if you have the house wired in a series, you will need to be re-wired. Good luck!