Building New Computer

I'm looking to build a new computer, but am seeking advice as to which components to include (and what's compatible). Here are my requirements:

1) No price is too low- I'm a broke college student (graduating soon though thankfully).
2) I use the computer for tons of things, but at minimum it must be able to handle Starcraft II smoothly. Also, I multitask a lot.

Here's what I have so far:
Case/PS $ 80 http://www.newegg.com/Product/ComboDealDetails.aspx?Ite...
Mobo/Proc $255 http://www.newegg.com/Product/ComboDealDetails.aspx?Ite...
VidCard $ 49 http://www.newegg.com/Product/Product.aspx?Item=N82E168...
RAM $ 80 http://www.newegg.com/Product/Product.aspx?Item=N82E168...
HDD $ 0 Already have a raptor at home.
Monitor $ 0 Already have a nice monitor.

So again, anything that can lower the price. And I also want to make sure everything here is compatible.