Ok I'll list my suggestions:
Case: Get a Antec Sonata II, much you save money on the PSU and case, because they are both included in the $100 price, high quality products.
Don't get a SLi board, and get a Asus A8NE which is cheaper and better.
I would get either a 7600 GT or GS if you really don't have the money.
PSU, I would always go Antec, though if you get the Sonata II you won't need one.
Personally I would get a AMD, which would go with the board I picked. I would go with a single core Opty 148, which is really OCable. And easy. It might not be dual core, but you really don't need it. If you want dual core, I would say spend a bit more and get an Opty 165.
I like your ram though I would go for this, for less, because of the rebate on it, and its more RAM and better RAM. Click
here.
Good HDD, exactly the same one I'm getting.
But the final thing I have to say, isn't about your components. Its about where you buy them. I have three places I shop. I use NewEgg and
TG Stores to find the components I want to use, and then I use TG Stores and Froogle to find the best prices. NewEgg hardly ever has the lowest price if you include shipping. And ZipZoomFly almost always does, but thats just my personal experience.
DDay