Rusty,
If you choose to go home plug, you need 1 adapter (ethernet connection) and that will plug into a wall outlet and via Cat5 to the linksys router. Both 622s could then connect to the router through the home plug adapter, as I understand. Also, since the 622s have the DishCOMM feature, they should be able to communicate with each other and since 1 is connected to the ethernet already, I believe they both will be considered connected, and you wouldn't need to use the home plug at all. DishCOMM is somewhat sensitive to power strips and UPS' that filter out signal, more sensitive than home plug. I bought a Belkin home plug adapter off e-bay for under $20 including shipping. I'm thinking of getting a second one so I can connect my work computer (no wireless) in my bedroom.
Miner