Keep the CPU + RAM Combo.
Keep the case. Lose the Caviar green. Go with Samsung Spinpoint or Seagate Barracuda. If you really wanna save, go with Caviar Blue.
Even if you don't change the HDD, you absolutely have to swap that ECS Mobo for a MSI 785GTM-E45
. A bit more expensive, but well worth the price.
Keep the rest of the build. Looks good.
If you do wanna save a bit though, go with the AMD Athlon II X3 440
- you'll save 'bout 25 bucks there, if you don't absolutely need a quad.