my new pc has a coolermaster storm enforcer case,it has a usb 3.0 at the top front panel,it was$100AUD ,it depends what type of case you like
+1 to this, i built my first computer about 2 weeks ago with this case and it is brilliant, it has 2 usb3 ports at the front, i think it was £70. It has loads of space you can take out one of the HDD cages for extra space fits my huge GPU and cooler in no problems. I would recommend getting the red led coolermaster 200mm fan for the top too, it is exactly the same as the pre built front fan and makes it look awesome!
Does your mobo have a USB 3.0 header on it?
I ask this because some cases route 3.0 cables out the back of the case to connect to the rear panel. Others have a 3.0 header which connects directly to the mobo internally.