The magnavox box (their newer black model without the power button on side) is the best in my opinion. it picks up signals as weak as 18% without breaking up.
Dish's DTVPal Plus has one of the best EPGs, and a ok tuner, but the tuner requires a signal at or above 58% to keep a steady picture, and channels i watch a lot, like RTV and This-TV, don't work on that box since they're weaker than that. lately the Magnavox has reported they're at about 18% but it's watching them fine. even my new Samsung
HDTV Tuner has trouble since it's tuner has the bar set rather high for a steady picture.
If you normally get good signals above 58% the Dish DTVPal should work for you. but i'd recommend, from my own experience from weak signals, that if your signals fluctuate at all (which boxes don't like, they usually peg red after enough fluctuations and i call that 'red zoning') or are less than ~50% the Apex and Magnavox work wonders. only the RCA DTA801 seems to suffer 'lock-ups' and software/ROM failures in my experience. it never picked up anything aside from PBS and was my first digital box. the worst IMO.
and do NOT use the batteries or the cables with push-on quick connects that normally come with the box. i'd recommend good higher quality gold-plated high quality coaxial cables and a brand name or good battery. the batteries that come for the remote are lousy and hardly work long, if at all. and the quick push on type cables cause a ton of signal fluctuations.