I gotta echo Silvie on the CP-850 ..... not putting a CP-850 in there would be criminal
... The 1200 is a CPX form factor case and the CP-850 is made specifically for that case on two others (P193 / P183)
Don't get me wrong, electrically the HC850 is an extremely high performance PSU.....but not only does the CP-850 match it electrically, it's also quieter than the HX.....not to mention $70 cheaper than the HX. The CP-850 makes the Editpr's Choice List at
http://www.silentpcreview.com/article699-page1.html whereas the HX gets rated a notch down on the recommended list. The corresponding jonnyguru reviews are listed below:
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story5&reid=153
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story4&reid=142
If the CPX form factor catches on, the CP-850 will be flat out untouchable. It is completely unmatched by any ATX unit on the market I can think of. You'd have to spend twice as much as this thing costs to find the next best thing, performance wise.
I don't know how Antec managed something this awesome for such a low price, but they must really want the CPX form factor taking off if this is the performance we're getting.
http://www.silentpcreview.com/article971-page7.html
The Antec CP-850 is a superlative power supply by almost any standard. Its electrical performance is up at the level of its more expensive brethren, the Signature 650 and 850, and Seasonic's flagship, the M12D-850: Voltage regulation is extremely tight for all the lines at all loads, and the ripple noise is amazingly low.
The noise performance is excellent, with the <400W performance matching or bettering virtually every PSU tested thus far. Above 500W load in our heat box, the noise level goes over 40 dBA@1m, or about the norm for PSUs rated this high. It has the virtue keeping itself extremely cool, however, cooler than any other PSU we've tested at such high loads.
Our atypical spot check with a room ambient thermal test showed the CP-850 would reach only 24 dBA@1m at 700W load in a 27°C working environment. This is ridiculously quiet for such high power output.
For the quiet-seeking computer gaming enthusiast, the CP-850 (along with any of the three compatible cases) is something of a godsend. Fantastically stable power, super low noise at any power load, long expected reliability due to excellent cooling, modular cabling, and all at a price that's no higher than many high end 6~700W models. That you're limited to one of three well-executed high cases from Antec — one mostly for silence (P183), one mostly for gaming (1200) and one that's really an ultimate everyman case (P193) — is not exactly a hardship either.
MoBo - Not a fan of the AsRock ... at this point, I'm thinking USB 3 and SATA II compatibility is the way to go and that points to the ASUS P6X58D Premium .... the PSU cost savings should get you most of the way there. If budget still a problem, consider an 1156 based system which uses 2 x 2GB memory saving some more moola.
RAM - You'll need a 3 x 2B kit for 1366 socket MoBos.
Hard Drives - Check out the performance charts and pick whatever 500 GB per platter drive performs best under your usage patterns. The WD Black 2 TB is a good choice but at smaller capacities, you are limited to the Seagate 7200.12 or the Spinpoint F3. The 7200.12 excels in gaming, multimedia and pictures whereas the F3 wins at music and movie maker. See the comparisons here (copy past link in manually, link won't work in forum):
(http://www.tomshardware.com/charts/2009-3.5-desktop-hard-drive-charts/compare,1006.html?prod[2371]=on&prod[2770]=on)
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