Well, Onkyos have a great feature/dollar ratio, but have had a bad run of HDMI boards smoking out lately so I'm not too sold on them.
I have no experiencewith Yammies but many here love 'em.
I've had a Denon for 11 years (and may be replacing it within a year or so) but I'd go with them without blinking an eye.
I'm looking at Marantz simply because more of their receivers offer multi-channel analog inputs which I need for my SACD player. That's a feature I demand.
speaking of features, that's something you need to concern yourself with. Get all you need and try to avoid the costly superfulous ones, if you can. Sometimes you can't. They are part of the package.
So, before we can help you, what do you need in a receiver?
Do they have enough of the inputs, and types that you need? Do you anticipte adding an external power amp in the future? It's easier if you tell us what you need rather than expect us to guess at your needs and list all the features for you.