I have this crazy idea of using a home theater system as a makeshift sound system for a reception hall music substitute. I'm not looking for a blow-your-mind sound system, but I'm hoping this project will sound better than just sticking a boom box on a table...

The room is probably about 600 sf, but the music would be required to fill mainly the dance floor area, about 200-400 sf.

Being on a budget, I was thinking of the following:
Entry-level ONKYO receiver at 65-75W/ch (high current)
a 5.1 speaker system sats at 86-88dB sensitivity, 100W
with a powered 8-10" sub (Polk Audio RM 6750)

WILL THIS WORK?