Here we get into the usual "how big is your room ?" and "how loud do you need ?" questions. Axiom guidelines are roughly :
- under 2400 ft3 is fine for bookshelves
- over 2400 ft3 should be towers
- over 4000 ft3 use M80s (HK or Denon receiver should be OK at normal volumes)
- over 6000 ft3 use M80s with a big power amp
Running with M80s in a smaller room doesn't seem to be a problem as long as you don't end up sticking the M80s too close to the wall.
EDIT -- also note that power ratings on receivers tend to only have a vague relationship to what the receiver can do. HK receivers seem to be rated with just over half the power of comparably priced models from other brands, but the actual measured power is very close.
I think that's why most people here talk in terms of "you need a 1905" or "go with a 2805 buddy"
