for reference
DC proper -- Northwest, and not much else
I'll second grawk's indirect advice: go Virginia. Vienna is expensive, but nice.
MD -- aardvark samich isn't far off, most of the metro accessible green line is pretty bad, but U of M isn't bad, as long as you're not a coed, yourself. But don't stray too far. Stay away from the Maryland branches of the blue and orange lines.
Red line -- the West leg is expensive but nice as well. The Eastern leg of the red line is a little bit less nice, but probably within reason.
What are you looking for, to buy your own place? House or condo? To rent an apartment? A room? Go joint on a house? Is this the beginning of something long term, or only temporary? If the latter, for how long? What kind of music are you going to listen to? You'll need an amp. If you save for a bit and spend just a little bit more, you can get something a lot better.