First Desktop Build

PSU: PC Power and Cooling Silencer Mk II 950W High

you did your homework  

if those the parts you want then thats an excellent build.

A good list of parts, but I have a few suggestions.

For editing the 2600 with hyperthreading is appropriate. But, why not buy the 2600K instead? The extra $25 will give you the capability of raising the default multiplier from 34 to the 40-45 range, giving you considerably more compute power.
You need not oc immediately, but I think it would pay to preserve that option.

Supposedly in April, the (22nd?) ivy bridge is supposed to launch. If your build time frame is that flexible, it may pay you to wait. For the wait, you will see a 10% improvement in performance and probably better overclocking. The 3770K is a 3.5 base ghz chip which will be priced similarly to the 2600K.

I would buy an aftermarket cpu cooler with a large slow turning 120mm fan. It will keep your cpu cooler and quieter. The backplate mount will be easier than the stock intel cooler. $30 or so buys you a cm hyper212 for example:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

If you will be using a 64 bit enabled editing or other app, then buy lots of ram. Ram is cheap. Here is a G.slik 16gb kit for not much more:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Sandy bridge, and I presume ivy bridge is not sensitive to ram speeds, so 1333 ram is fine. Read this:
http://www.anandtech.com/show/4503/sandy-bridge-memory-...

For graphics, I think the GTX560ti or similar is appropriate.

But, it only needs a good 500w psu. The newer 28nm graphics cards will be more power efficient. The 7970 needs the same 500w psu, and I think the upcoming GTX680 will need the same. If you ever want to upgrade graphics, just replace the GTX560ti with a stronger card. No need for cf/sli and extra power.
I suggest you back off on the 950w unit, and look for a quality 650w unit.
Look at Seasonic, PC P&C, XFX, Corsair, or Antec for a quality unit.

Cases are a personal thing. Buy the haf 932 if you absolutely love it.
As an alternative at half the price, look at the Antec 300 illusion model which is a perennial favorite:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

If you want a quiet, simple case, look at the Antec SOLO II:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

For a similar price, in the 120gb range, I might go with a samsung 830 SSD, or, the Intel 520 unit which is a tad higher, but comes with a 5 year warranty.
Both are considered to be the best for reliability and trouble free operation.