HI shockwave,
if you have a car,i would suggest you to move wherever you feel comfortable. There are amazing places around College Park, from urban areas to rural areas. Some nice places to look around within 20 min of driving distance: Silver Spring, Bethesda, Laurel, and obviously DC if you can afford it. Greenbelt is also 10 minutes away from the campus.
You can check the graduate handbook and in off-campus housing website there is also a document with more information.
Finding housing is time consuming, and the area is known for the mold problem.
Prices? it will depend on the area, but if you want to live in an apartment/condo with some facilities, rent starts in about 1000. In DC.. multiply by 1,5...2
My 2 cents.. ask me whatever you need. housing is a real issue1!