For the power supply, you would want to look for something ~400w. If you have any thoughts of adding a 2nd video card, then you would want a psu ~750w. The good brands are antec, PC power & cooling, OCZ, and seasonic.
Good mobo manufacturers are Gigabyte, Asus, and EVGA. If you are getting a quad or dual core, then the p45 chipset is a good choice. If you go with the i7, then look for the x58.