I have a Denon 3802 with the same speakers (except for the sub) and I'm quite happy with the sound. Unfortunately, I haven't heard an HK receiver, but I would assume from reading others reviews that it wouldn't be "warmer" compared to the Denon. Denon is very "neutral" in my opinion, therefore makes a nice match for the Axiom's. If someone tells you that the Denon is not "musical" (which I've heard a lot), don't believe them. The Denon can produce clarity and an open & airy soundtage.

M60s
VP150
QS8s
Marantz SR6003
Samsung LN52B550
Oppo DV-980H
Insignia NS-WBRDVD