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If you already have a HD screen, and you don't want PVR funtionality, then of course you get a HD STB.
Agree 100%
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When people buy a HD screen and come here to find out which HD STB is good, they shouldn't be recommended any SD equipment
Agree less so. Yes there is a specific DVD Recorders & Hard Disk Drive Recorders branch but the whole digital TV arena is new to everyone and I suspect are that most people's first point of call is the (badly named as it should just be the HD STB branch) HD/SD STB branch - which is what most neophytes would understand is 'digital TV'. Put simply people just don't understand their options.
While the 'What's a good HD STB' query is oft asked (and always specifically answered by plenty of people) I don't actually think there are many times someone has asked such a specific query and then been bombarded simply with 'Get a SD PVR'. Often the question has been phrased 'Why should I get HiDef', 'Is Hi Def worth it', etc. as (until recently) the querant was looking at spending $500+ on a box. Or TV viewing habits are mentioned flagging ignorance (like Should I get this HiDef STB and this model DVDRecorder?').
Personally, I rarely get into discussions on which is the 'best' solution. I'll try answer as impartially as I can (with a definite PVR bias) to find a solution that fits what I believe the user will most be happy with. We all just provide information (and opinions hopefully well flagged) and people enquiring, obviously skip stuff they have no interest in.
The number of times posters have evinced an interest in a SD PVR after simply assuming that their only option is to get a simple HiDef STB does tend to make me think its worth suggesting. It might be unfortunate that when provided the buy a SD PVR or buy a HD STB many people see more value in the PVR but its a common occurance. Theoretically the discussion should be moved to another branch but it does seem reasonable to continue the conversation where it was started? - esp as people will no doubt be providing pros and cons about the topic as a whole.
When a HiDef PVR hits the market for under $1000 I will be suggesting that as the 'ultimate machine' but till then most viewers will have to make an imperfect choice between HiDef STB and SD PVR (Although I often recomend a HiDef STB and a cheap single tuner PVR as a viable option with the obligitory caution

)
Regards
Peter Gillespie
PS Just a last thought. Most people enquiring about STBs (HD or SD) haven't really given much thought to recording digital TV and make incorrect assumptions about how it works. Its unfortunate that after they buy their expensive equipment they have to come back to the forum and do more digging and find out that the STB was probably not what they wanted.
PPS Last last thought (promise) - I don't think anyone ever asks about HiDef on this forum and isn't given plenty of information that 'specifically' addresses there query.