The 1500 is hooked up, and I cannot tell a difference. I also tend to not listen to music at the levels a lot of others do, so I am not taxing either amp.

The 1500 will pretty much sound like a 1000, but have about 3 dB more headroom.

Ian and Debbie are convinced the 1500 is THE way to go. But if one is thinking in terms of dollars, the 1000 is a bargain.