I'm just on regular DirecTV. I'm paying $80 a month for 3 receivers counting the TiVo one, HBO, local channels plus, (has more science channels and stuff), and TiVi service.
I know HD is offered but since all I own is three TVs that all are 6+ years old and given to me because someone wanted something better DirecTV HD would be kind of a waste for me right now.
One of these days I'm going to get a HD TV…
But when I do DirecTV's website is where I'll go to see what is offered.
http://www.directv.com/
Check out their specials. I've pretty much gotten all my equipment including getting it installed for the price of signing a one year contract. Once to get to receivers and once to get another drop put in with a TiVo. I'm very happy with DirecTV. Lately I'm been buying the PPV movies a lot. They automatically get saved on the TiVo so it's just like renting a DVD without a return hassle. It's nice, one click, done.