Adam, my suggested alternative to either of the Denons would be the Onkyo 818, with slightly better specs and having the best Audyssey MultEQ XT32 auto-calibration and room EQ.

If you go with one of the Denons, the 3313 has slightly better numbers and if you can get it for less, there would appear to be no good reason to get the X3000.

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Enjoy the music, not the equipment.