I use a Denon 3808ci in my HT and an ATI 1506 to power five SongTower speakers in a pretty large space in my basement.
I think the ATI does a great job in driving the SpngTowers with authority, while producing a sound that is non-fatiguing and allows me to watch movies, concerts, or tv for hours.
You can pick up an used 1506 for well under $1k.
When running all channels normally on the 1506, each channel produces 150 watts. However, you can bridge two channels to produce 450 watts per channel!!