I keep going back and forth on this, but up on the block now is my Stewart World 2.1. Excellent working condition with a few usual scratches. Incredible sound and power, just way more power than I need right now. It's a "Dual Monaural" amp that goes from 400W x2 @ 8 ohm to 1800W when bridged. Here's the link to the manual:
http://www.stewartaudio.com/manuals/World Series 1.6-2.1- Manual.pdf
17 lb
$375 shipped conus
http://www.stewartaudio.com/manuals/World Series 1.6-2.1- Manual.pdf
17 lb
$375 shipped conus