In terms of true HD programs, the only one on those channels I watch is Monk (all the ones starting with S06 E10 are in HD, and some earlier ones are presented in HD, while other older eps are not).
Well crafted disposable entertainment, and family-friendly.
I also have watched Doctor Who for over 30 years, and the current episodes are very good, and are presented in OAR and better-than-usual-SD quality on SciFi-HD. (The producers of Doctor Who refuse to film in HD, for reasons not particularly relevant to this thread.)