As classicsat has said, to get HD you will need the newer DVR. The HR10-250 does not receive HD.
Why not get the "Free Upgrade" - KAKU 5LNB Dish and Newer DVR Unit, but also keep your HR10-250 unit. That way, you will not only have HD, but still have the Tivo interface on the older unit.
And who knows, maybe you may find the user interface on the newer unit good to