For a general case, the Antec Sonata 3 that Bobblehead recommended is good.
For something more advanced, bigger, and potentially quieter I really recommend the Antec P182, super case, can be very quiet, and easy to work in.
For power supply, you want something that is effecient. The one that comes with the Sonata 3 is good, or if you get the P182 then you have to get a seperate case, I recommend anything by Seasonic or Corsair.
Here's a good list of good power supplies:
http://www.silentpcreview.com/article699-page1.html