NASA, CSPAN and all music channels are on 72 (72.7)
I had a similar install yesterday, and in my case I opted to keep the second dish, so I can get 110. So I now have the 1000.4 dish (replacing my old 61.5 dish), that gets me 72.7, 77 and 61.5 and I also get 110 from the old Dish500. In reality, I cold've went with a sigle dish (I only get 2 SD local channels, which I never watch off 110), but I figured since I already have the second dish on my roof, I better keep it there, rather than worry how well the tech fixes the holes on the roof after removing the dish.