#1
My band needs subwoofer(s). We play small/medium size rooms w/ about 150 people.
I see good things about:

http://www.sweetwater.com/store/detail/PV118/

I was wondering if 1 would be sufficient.

Also, what kind of power amp would I need (budget is a factor)? The ohm and wattage stuff confuses me. I don't want to destroy anything.

I would also love to have the power amp run the sub woofer(s) and 2 12" floor monitors (if thats possible)

Any tips/suggestions would be GREATLY appreciated. THANKS!
Amps:
Mesa Boogie Dual Rectifier
Vox Valvetronix
Guitars:
Gibson ES-335
Gibson SG Standard
Taylor 214CE
FX:
Tech 21 Killer Wail Wah
Digitech Whammy
Small Stone Phaser
Boss DD-20 Delay
Line 6 Verbzilla