I used to have a sonicview 8000. It suffered a lightning strike. When it was up, it was useless for blind scanning. The signal meter on it was never sensitive enough. I am happy now using a Viewsat Ultra for my SD blind scanning. It is not the best, but I couldn't beat the price of the unit. I also had problems controlling my SG2100 with the Sonicview, along with difficulties using a 4 port switch. My Viewsat handles these just fine. If I had a choice for a basic SD unit for blind scanning and a motor, I would go with the Traxis 3500 or Viewsat Ultra.
As others have mentioned, for the HD stuff, if you demand 4:2:2 video and have an appropriately sized reflector, the AZbox and SSO are out there. If you dont require the 4:2:2, then I think one of the Pansat HD units with the S2 add in card would be great. Besides feeds, there doesn't seem to be a great variety of regular HD content that is truly FTA.
If you are looking at the C-band legitimate subscription stuff, the DSR-410, DSR-9XX series should serve you well. I haven't seen any HD options this route besides pricey sidecar units and that is what is keeping me from going this route.(if someone knows something I haven't seen, please feel free to PM me on this)
There area few HD boxes out there that the eye patch crowd covets, but I recommend staying away from them.
This really is a loaded question with no single answer. Too many variables involved. Money, personal preferences, geographical location, dish size limitations, and spousal approval are just a few of the many variables.