My take. I too would mark Harmon Kardon off the list. Their higher end stuff is nice, but their low end stuff is to be avoided. Check that for yourself in the audio forums. So that narrows it to 3--Onkyo, Denon and Marantz. In my experience, any of these three brands would serve you well.
I prefer the top tier of Onkyo's stuff as well, so for me that would narrow it to either the Denon or the Marantz.
As with firearm recommendations, go listen to both of these receivers for yourself--all of them for that matter. Try to listen to them with the components you have so you can get an idea of how it will sound in YOUR system.
Pick the one that sounds good to YOU. Choosing one that one of us likes may not make you happy.
So there you go, in the spirit of Charlie Brown, that is my best wishy washy, filtered for the Nsync generation, politically non-committal answer.