You cant get a better PSU for that price. It's an Antec Earthwatts 650W btw. Not cheap crap.
As for the Rosewill case, it's pretty decent for the price.
i would reccomend you spend good money on the case, a good case will give you the airflow you need for a cool rig, try the lanboy air, comes with 5 free fans and you can add another 10, *** aftermarket cpu coolers