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At any rate, look for a i5-2400 CPU. Not overclockable, but only 10% slower at stock speed than the overclockable i5-2500k, and still plenty fast.
A low end ASUS or Gigabyte z68 motherboard.
2x4gb DDR3 1333 speed ram.
An AMD 1gb 6870 video card.
Western Digital SATA 6gb/s 500gb hard drive
Samsung DVD RW.(around $17)
Coolermaster HAF 912 case.
SILVERSTONE ST50F-ES 500W power supply.
These are best bang for the buck, and more than enough for your requirements.