You should never cheap out on a PSU. The PSU is the most important part of your PC. You should try and get a 550W Antec, XFX, EVGA, Seasonic, Superflower or Corsair (HX/AX/TX) PSU. 240GB SSD by itself isn’t enough. You’d want at least an additional 1TB (or more!) HDD. If you’re focusing on performance then don’t spend much on stuff like keyboard/mouse (ironically I just spent $250 on a new keyboard and mouse a couple weeks ago! So much better than crappy Dell). You should really try and get a quality display.