I'll admit to being a bit of a Yamaha fanboy and would take the 667 over the Onkyo any time. But it seems to be a lateral move to me.
Silent Cinema is over rated IMO. It's a bit of a clever novelty at first, but it gives a rather false sense of spaciousness to music and doesn't compare to similar soundfield setting used by speakers. While I perfer PLIIx when using speakers the same doesn't hold true for headphones. I use Pure Direct or stereo for that purpose.
JMO.