some quality psu, like corsair, enermax, antec, cooler master, power&cooling, at least 550W, preferably 650W. about the case, a lot of them are good, look for cooler master and antec.
My recommendation on Power Supply is at 850 watts - this will grow with your system - Also highly recommend the modular system - use the power cords you need, this will keep air flow better in the box. This will cost more money, in the long run, it is worth it and I think you will love the modular system and glad you bought it.