Butler definitely isn't luxury, but it is probably the best deal on campus in terms of housing. They do get cold in the winter because there is only heat duct in the middle of the house, but most people solve this by using space heaters. I know a few families that live there, but also many grad students use them as doubles because they are so cheap. (All of this being said, they are either being renovated or destroyed in 2013, I don't remember which though.)
If you have a pet, you might also want to try Millstone Apts (they are nicer but a little further from campus, I don't have much other info about them).