Without knowing the resolution of the monitor you are using its hard to recommend parts . Thats critically important
But with regard to some of the parts recommended so far
The NZXT gamma is is cheap junk . Even in that price range there are better options , but idealy pay another $20 and buy a case that is well made .
The intel i3 is a decent option in this price range , it is usally beaten by AMD phenom quads in that price range . The quad will also remain responsive in situations where the i3 is too busy to do a third or forth task simultaneously
Graphic card recommendation without knowing your resolution ? Better off taking your money outside and setting fire to it to enjoy the glow