PA Speakers for Parties


Hello,
I am brand new to this whole scene. I am in a fraternity and got elected to run certain aspects of our parties. What we need are PA speakers (our old ones broke) They need to be self powered, I am not really sure what exactly a decent setup would be but parties are generally in a huge room with close to 100+ people. We had two older speakers that managed for a few years before biting the bullet. Anyone have any leads they can give me or tips, brand new to this whole thing.
matthewcarnali
Post removed 
Thanks for the input, I literally have no equipment, its mostly to play ipods with playlists and such. My budget is around $300.
I think your budget is unrealistic.. Big room ( get the exact dimensions) lots of people.. playing dance music.. you're gonna need some real stuff.. Google is your friend, but here's a link to get you started.. might even want to give them a call... http://www.sweetwater.com/shop/live-sound/pa-speakers/