Last summer I upgraded my system to an HD 6100 system. I went through the same incmpetance when speaking with Bell. Ultimately I discovered that as an existing subscriber (5 years at the time) and I didn't subscribe to HD. I was allowed to purchase a 6120 system. As you stated earlier it comes with a 6100, dish 2nd LNB and a SW21. At the time the 6120 kit was on sale at Future shop for $229.00. I had to get the salesman from FS to call Bev and get it registered with them. All in all it pays to do research when upgrading with them and not to agree with the BS the uniformed Bev drones speak of. Anyways my newest project is OFF AIR signals and the 6100 off air tuner.
P.S enjoy the HDTV hifi_ott, once you get used to it SD programming will no longer be of interest to you.