You're not in the 129 sat. footprint, so you will need something like the D500 for 110 and 119 sats and a separate dish (D300 or 500) for the 61.5 sat. for much of the HD programming including voom. Four Boston HD LiLs are also in that same slot. I'm not sure where your SD LiLs are (if at all), but you can check for yourself at:
http://www.dishchannelchart.com/
Thus far I have been disappointed with the OTA tuner in the first 622 I received. It is less capable than both the tuner in my TV and in my existing 811. But others have reported excellent results with the 622's OTA tuner. Mine is being replaced for other reasons and I'm hoping the "new" one will also have a better OTA tuner. Maybe someone with experience with both the 622 and HD-SAT500 can chime in.
Good luck! I think you will enjoy the 622, as I expect to as well someday! (Don't look at it, just look at the HDTV...!)