I installed the 601 for a customer and I have to say I was surprised at the power output. It was easy to setup and pretty full featured, and the 602 has the Auto-setup feature. I've never been a fan of Denon's lower stuff, so I'd say the 602 would be a good choice.
Weight doesn't tell you how it sounds, so yes, you have to listen to it. The 1015 will likely have a few more features than the 602.