Why on earth wouldn't you continue to use your Anthem and/or Rotel gear?
Nobody ever seems to complain about anything with the Denons.
M22's are really a pretty easy load, so any decent receiver should do the trick. Just set a budget and find something that has the features you like.
Grunt is using a newer Onkyo to drive M80's with good results. I have an Onkyo 805 with M60's and am very satisfied. Even their mid-level models now seem to include network capability and can often be had as refurbs for an excellent price.
