I recently purchased a house and had the same decision as you do now. I am a big sports nut so DirecTV was an easy choice. Don't let the channel numbers fool you. They pretty much are a useless gauge to measure with. DirecTV for example, has 15-20 SALES channels. Think QVC for every damn product under the sun. Quite annoying. Luckily, the DVR makes up for it with playlists. Can create any kind of playlists that you want and view them in any other room where you get the HD receiver.
That leads me to the DVR that I received. If you get the Whole-home DVR option from DirecTV you will get the HR24-500 DVR receiver. It is very slick. The menus are smooth and setting up recordings is a breeze. If you record your favorite show in the living room, you can access that recording from any other HD receiver in the house. It will let you continue the show from wherever you stopped at as well.
The HD receiver was just released and is a mandatory installation for the whole home DVR installation as well. The model number on it is, I believe, H25-500. It is a very small black box with an external power brick to keep the size down. This little box handles the menus/guides as well as the DVR does, but there is a slight lag when fast forwarding/skipping ahead 30 seconds if watching a recorded show. It is to be expected but shocked me the first time I saw it.
The installation was done very professionally. They will add charges for using poles for the dish, adding outlets, that kind of thing. Just make sure you are present and try to help them with an easier solution.
Obviously, my statements here are pro-DirecTV but so far I've been very happy with my service. The 2 yr agreement was an annoyance but, just like cell carriers giving deep discounts on phones, they have to make up some money for the initial cost involved with giving away this nice equipment. If you have any questions please feel free to ask.
Some resources I've found very helpful:
http://www.dbstalk.com
http://www.satelliteguys.us