I have investigated the Mistubishi and the Toshiba and a couple of others which are apprently all made by Hughes.
The final result I bought The Sony HD-100 it seemed to have the best ability to pull in digital OTA stations even from a considerable distance.
I also hear the Panasonic is quite good but it also costs more $
For me the best quality / price ended up to be the Sony
It is also prety seamless channel switching between regular cable, satellite and OTA signals and chanels.
Others you have to change the settings and go to the menu for that.
It also sounds pretty darn good from the digital optical output (even when I hate Toslink connection, I think the Dolby Digital output sounds great!)
Good Luck to you
Gonzalo