vazim:
Denon is pretty good, but you need to look at these specs for the audio portion of any amplifier:
Power: the more the better (make sure it is quoted as RMS power at less than 0.01% THD)
THD: the less the better (0.001% or less is excellent
Frequency Response: 20 Hz to 20KHz is good, but 50 to 18k is good too.
At least 5.1 output, 7.1 better, pre-out/amp decoupling a good option for later expansion
THX certification if possible
What are these specifications for the unit you are looking at?