New Integrated or Older Power amp?

So I currently have a 20-yr old NAD 7240PE receiver and am trying to decide how to upgrade. I'm currently looking at replacing the receiver with a new C326BEE integrated or simply adding a used (~10-yr old) C270 power amp and keeping the receiver as a tuner/pre (for now). My question is, aside from the difference in power, which setup is going to give me the better sound quality - the C326BEE or 7240/C270?

Thanks,
Steve