Cases are like cars you get what you like (size, shape, fancy toys) pick what you like (I always advice with nice 120mm front and back fans so its quiet.
Get good 500W power supply any 80 Plus certified will work fine (at-least 50+$), Just check if your video card requires 1or 2 6 pin power connector and buy with that option.
Personally i use Antec got 430w and 500w so far over 2 years good. like thishttp://www.newegg.com/Product/Product.aspx?Item=N82E16817371035
BTW your build will consume 300watts on full load.