The Onkyo/Pioneer/Integra models are badge engineered cousins.. they differ marginally in features but have the same core inputs and outputs, and the same circuit boards, so one would expect very very similar sound.
Did you make a decision ? which way did you go?
I have ordered an Integra DRX 3.4 - it is the near cousing to the Pio LX305 and Onk NR7100 - but adds a full set of pre-outs to the mix.
Availability is an issue here - and I have been waiting 6 months now.