I don't know the VSA-LX53. I thought Pioneer was a Japanese company? What models do they have there?

Quite honestly I don't think you will notice much audio difference from any of these compared to the Denon. There may be a different set of features, and you will need to look up the product page for each receiver and do comparisons.

Axiom M80s + QS8s + VP180 <-- Pioneer VSX-1120-K <-- Squeezebox Touch / XBox360 / Oppo BDP-93