As you stated, you could not hear any difference. Solidstate AVR's that are designed to have a flat freq response from 20hz to 20khz won't sound different, unless your introducing one of the special EQ, tone, or DSP functions that come with many AVR's.
I would go with one of the Denon's as long as it has the Audyssey MultEQ setup, which right now is the best in the business.
I would go with one of the Denon's as long as it has the Audyssey MultEQ setup, which right now is the best in the business.