The features will all be relatively the same. The sound will be quite a bit different depending upon the speaker power requirements and the tonal differences between receivers. Denon and Marantz will sound very similar. Yamaha and Sony have their own rather distinctive sound. I would try to find a room where you can do some comparison shopping. Onkyo makes some great products as well. They tend to be brute force. Enjoyable for home theater not as refined for music as Denon and Marantz. Marantz being the higher end version of Denon. Little more refined sound somewhat less harmonic distortion. If you enjoyed the sound of your Denon previously you probably will again. Do you know if your speakers are 8, 6, or 4 ohms? What is their sensitivity rating? The higher the ohms and the higher the sensitivity rating the less power require to play loud. Polk usually is around 88 for sensitivity and 6 to 8 ohms.
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