Help: Speakers to fill Exceptionallly Large Room?


I'm trying to outfit a large coffeebar with a decent pair of speakers or monitors on a budget. The room is approximately 20 feet wide by 80 feet deep. My current plan is to place one speaker at the front of the space aiming at the bar and a second about half way through the space, again, aiming at the bar. Everything beyond the second speaker will be a "quiet" space for all intents and purposes.

Rules are that I cant use more than two speakers and they have to be wall mountable. I'd like the place to sound good, though I know it will be no acoustic dream, by far. Price range is probably $500-600, $1000 max. Should be relatively efficient, because I'll need some db's to fill the space. Any help appreciated. Thanks.
jaminsky
Look for a pair of of used OHM Walsh 4s or 5s if you can find a pair local to pick up. They are big and heavy and tricky to ship safely. You probably want an amp that puts out at lest 80-100 watts or so though to really get them going.

Smaller and easier to handle Walsh 2s might cut it as well. I had a pair once running full steam outside on a farmhouse porch off an 80 watt/ch Tandberg receiver and it sounded like a live band playing a good 80 yards away outdoors...one of the best "home audio" sound experiences I've ever had.
Pro series, wall/ceiling mount line arrays from Toa fit your budget. Also, look at BG Radia. Both almost require a sub, like all wall mounts.
I second the Bose 901s. You can hang them from the ceiling with chains and they are efficient and not demanding of the electronics that drive them. They have always worked great in bars and the like.