What is your budget? What are you trying to get out of the receiver? What is important to you? What speakers is it going to be hooked up to? What kind of listening environment? Have you listened to any of the receivers? Because of the different approaches to amp designs and what not, the different manufacturers will have subtle differences in the way their amps sound. So a lot of times specs become irrelevant and usually people end up setting up camp with what they prefer. I.e. brand a amp x sounds warmer than brand b amp y.... Figure out the questions above, then armed with that give the amps a decent listen to and see if you lean on one more than another.