Go look around at Directron.com
They have tons of cases, you should find what your looking for
I just bought an Antec SX830, should be here on Monday. Great cases, friend has one. The SX840 and SX1040 both have 400 watt AMD approved PS.
Just look around on the web and find which case you like the best. Directron.com is a good place to start. Also check with pricewatch.com to see if you can get a better price. But make sure its a good dealer, check resellerratings as well. Hope that helps.