NOTE: ALL MENTIONED BELOW POINTS ARE ONLY ABOUT HD DTH NOT DVR.
Claiming by RDTV HD they offers all non HD channels in upscale level. I suggest RDTV HD on basis of all non HD channels in upscale level. But watch demo before buy & then decided. Many times it may lies than they claiming.
Other HD DTH is D2H. They offering highest numbers of HD channels now & their packages also attractive than any other DTH according to my opinion. Here too you need check picture quality before buy.
Dont know about other HD DTH. Get information about other problem of different HD DTH boxes. Few times few boxes comes along with hanging / other problems.
Check also can user continue subscription from lowest basic pack / not / there is mandetery to subscribe HD pack.