Hi catcando,
I can't answer your question fully but I bought the Sagem DTR 67320T a couple of days ago and I have used the HDMI output to a Sony Bravia TV.
The Sagem was recommended to me by a colleague who has an earlier model without the HDMI out.
My initial impressions are that the picture/sound is fine and indistinguishable from the TV's built in tuner. Although I've only recorded a couple of programmes so far it has been faultless. The EPG could be a bit better in that the text could be sharper but it does everything that I want. I've noticed it also records the subtitles too which I find useful although others may not need them.
I've not tried other functions like dumping programmes to a USB drive or an external hard drive yet.
As it's new I can't comment on the reliability but my colleague has said that his has been very reliable and has always worked fine.
One of the features it does have is a low power mode which is less than 2 watts in standby and only around 18 watts when running.
I bought it to replace an Aldi Tevion one which has had problems virtually from day 1 and has finaly stopped working completely.
I don't know how it compares with a Humax but they seem to be much more expensive for a similar specification.
I got mine from Asda for £140 and they also had the 250Gb version for £129. Argos have got the 320 GB on offer for £125 but they don't have any in stock near me.
You'll have to check but I think Argos may exclude PVR's from the returns policy but I think Asda will let you return it within 28 days if your not happy with it.
See :
Argos :
Buy Sagem DTR67320T 320GB Digital Freeview+ Recorder. at Argos.co.uk - Your Online Shop for .
Asda :
Sagem Digital TV Recorder | Digital Receivers & Hard Drive Recorders | ASDA direct
(note that one reviewer on the Argos site said it was a bit noisy but I haven't found it so)
Hope this helps