I have an Antec Sonata Designer 500 with an included 500w earthwatts psu and it's fantastic. It's basically an Antec P150 with a few bonuses. I paid $88 with the psu, and I'd say you really can't go wrong with a simple, well-made case that doesn't have computer-ricer garbage like underglow, windows, a fish tank, or whatever ugly pointless shit they are including in "gamer" pc case designs these days.
Demon's Souls Official Thread | Currently playing: Left 4 Dead 2, LittleBigPlanet 2, Magicka