Building PC - need advice

Hey everyone, I am building a gaming PC that will replace my current and out of date Dell; A few points:

1. My budget is around 2000$.
2. I am wiling to overclock.

Now, I need your suggestions for the parts. While I do know some about building, I don't really know if I am getting the best deal and the best quality with my current list.
Also, I have not decided on a Hard Drive and nothing is set in stone and I am open to all suggestions.

The List:

Video Card: Some options: nVidia 570, Radeon 6950 or 6970 or the 5870.

CPU: Intel Core i7-2600 Sandy Bridge 3.4GHz (3.8GHz Turbo Boost): 300$

Motherboard: MSI P67A-GD65 (B3) LGA 1155 Intel P67 SATA 6Gb/s USB 3.0 ATX Intel Motherboard: 180$

Hard Drive: Not sure yet

RAM: CORSAIR XMS3 6GB (3 x 2GB): 74$

Sound Card (OPTIONAL): Probably wont include one.

Power Supply: XFX Black Edition XPS-850W: 150$

Case: Antec 900: 100$
 
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