I currently have a 1000.2 dish and 2 leased Vip 622's feeding two HD and 2 SD sets and I'm not using an external switch. I will soon have all 4 HD TVs with no need for SD. Will Dish exchange the two 622's for four leased 612's and install a DPP 44 switch? I know they have a four tuner limit but what about a receiver limit? What charges would I be required to pay? (Receivers, switch, service call, etc.) Thanks.