I currently have a 501 and want to upgrade to the new VIP 612. I am wanting to just buy one so that I don't have to rent from dish. I currently have the dish 500 and I didn't know if it will pickup all of my channels or do I have to upgrade to the dish 1000. I know that I will have to rewire and have two inputs to the vip 612, but that is all I know. Please help.