Typically when someone want's to upgrade they feel they are missing something with their current setup. If you tell us why you want to upgrade someone can offer some specific advice. How big is your room? If you want the latest features then any one of those listed will fill the bill. If its more power then i would suggest adding a 3 channel amp like the emotiva xpa3. I chose Denon for myself more for the styling than anything,all 3 brands offer similar features,most of which i dont need or use.
I would check the respective threads at avscience to see what actual users are saying . Only the lower end onkyo's seem to have some issues,but im sure they all have problems which go unreported.
