Depends on where you live and the installer. I would talk to them. There are several possibilities.
You could get the 1000.2, which has been Dish's standard HD dish, receiving 129, 119, and 110.
If you live in an Eastern Arc city, you could get a 1000.4 that receives 61.5, 72.7, and 77 (although there is no satellite broadcasting at 77 yet). Even in an eastern arc city, the installer could use the other options.
You could also get a dish 500 with a wing dish pointing at 61.5 or 129.