If you have a Dish-1000, and want 61.5 also, there is no reason to replace your Dish-1000. The simplest way is to simply ad the 61.5 dish (with DishPro LNBF) and connect the 61.5 directly to the "LNB In" port on the Dish-1000 (after disconnecting the 129 LNBF). In fact, if your installer really wants to save $$, he can just re-use the 129 LNBF on the wing dish.
Eastern Arc is entirely different, because it supposedly will include more than one satellite slot (i.e. more than just 61.5), so the dish for that doesn't even exist yet.
So, feel free to add a 61.5 wing dish for the new HD locals, but not yet for Eastern Arc.