Not sure what your budget is, but this will last you your entire "partying" career:
http://www.pssl.com/bitemdetail.tpl?eqint_KeyIDdata=35720&UID=2005041709283260
It's just under a grand for the whole package, including stands. JBL and Crown stuff is very good quality.
Behringer makes a 15" cab that has a built in amplifier. Might be just what you are looking for. Just plug a computer up to it with WinAmp and you are ready to go!
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Or even better if you got a buddy with a pair of turntables. $500 bucks and you are ready to rock.
B-stock:
http://www.americanmusical.com/item--i-BEH-B300-BSTK.html
Or, if you want perfect:
http://www.americanmusical.com/item--i-BEH-B300.html
And still only 600 bucks for a pair of 'em.
Or you could go Behringer seperates (amp and unpowered cab).
I go to college, and at a party, I'm always disapointed when some guy bought some CWs and is trying to push them. When your out partying or throwing a party, you need something to damage some peoples hearing.
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You want those blazzing, sometimes painful highs, and the durability of PA speakers too. People are going to be drunk around them. Home speakers are GUNNA BREAK. It's just a matter of when.
I've seen JBL Pro speakers get kicked over from their stand, fall to the beer soaked concrete, and still play like brand new. Actually, when that happened, the speakon connection didn't even come loose and it was still playing laying on the ground.
-Chad