I have a few comments, having done something similar recently for my workstation below:
I had to look up the case; aside from my disdain for Antec fans and things with LEDs, it looks like it has better than average cooling. One suggestion to keep your GPU a little quieter would be to put a 120mm intake fan on that side panel, with a filter on the outside. Also note the complete lack of cable routing options behind the board; your build will be a little messier by default, but it's not going to hurt anything.
That ASRock board is the first one I went to before upgrading to the Z68 version for the display outputs; you'll (and others commenting) notice that it's the highest rated P67 board on Newegg. There's a reason for this
. I can say from first hand experience that ASRock got P67 right, and you'll definitely enjoy working with this board; I can't vouch for how much better ASUS' vaunted UEFI implementation is, but I can say that ASRock isn't too far behind.
I went with the 2500k too. While the 2600k's Hyperthreading helps in some applications, games really don't make huge use of those virtual cores; and with an overclock to ~4.5GHz+, who cares.
I went with Corsair RAM because I think that G.Skill's red theme is butt ugly, but it was the same price, and I trust G.Skill as well.
Video card choice is spot on for the money.
Crucial's C300 is a great SATA3 drive, now that the kinks have been worked out. If you must have SATA3 it's either that or Intel's more expensive 510 series, since OCZ is back to it's 'beta-testing on the masses' antics again with the Sandforce 2 drives. If you are more concerned with reliability (I was after a Vertex II died), Intel's 320 series is where it's at.
In either/any case, you'll want more than 64GB, with 120-160GB being preferable. Spending money here sucks, but you're going to have to manage your space, and the more space you have the less inconvenience you'll suffer. I do think derFunk is right here though- while the SSD caching isn't as fast as a real boot SSD, it'll speed things up appreciably and cut down on storage management- the thing is, if you're going to spend more money just to get that feature on a board, you'd might as well just dump it and a little more into a bigger drive, in my opinion. Better to do things right the first time.
For the main drive, you'd might as well go with something quieter than the Black as DancinJack suggests- they're very crunchy drives while seeking and your selected case has only a little mesh between you and the drive cages. Here I prefer WD's 2TB Green if only due to having a pair that are fast enough, solid, quiet and cool. I use one Green drive to back up my SSD, and just move whatever games/applications over to the SSD that I use often.
For the PSU, and the love of all things holy, follow DerFunk's advice- get something besides Raidmax. I'm not saying that it won't work, but the peace of mind here is worth it. I agree with the Seasonic or Corsair recommendation, though I don't see the
need for anything modular. If it will save you an appreciable amount you can zip tie the extra cables to the bottom of the case and easily tape them out of the way; it's not like you have a window to show your mess!
I can't comment too much on the sound card- I went with Creative, but I may find myself regretting that decision if I can't get it to do what I need it to. If it doesn't work out I'll be selling to cover my losses and going with an HT Omega eClaro, but I have a specific use; if you're just trying to get better output than the onboard, ASUS seems like a fine and well regarded solution.
For the CPU cooler, derFunk's suggestion is spot on. I used one of these for a friend's i7-860 build back when those were the thing, and it's dead silent. I was able to get 4.2GHz easy under load with Intel's stock HSF, so it's not like you'll need much more to hit 4.5GHz. My 2500k does this wonderfully under stock volts.
My comments on the build overall:
I'd go (and did go!) with a better case.
Fractal Design's Define R3 was suggested to me by another forum member, and it's exactly what I was looking for. Since I was using two HD6950's to push a 30" 2560x1600 monitor, the extra cooling options were welcome, and the insulation is wonderful. Having just finished the build I can say that this is one of the better cases I have used in years, and while I did fill it up with fans and add some fan filters (I have the front 120mm fans and the four 140mm fans all set as intakes, with my Corsair H60 and two HD6950's as the only exhausts), this isn't necessary for a one card configuration.
With your resolution, you don't need the 2GB card; you may never need it. I understand why you'd want it though. For reference, back when I had my GTX570 (traded for one of my HD6950's), I was using 1100MB maximum VRAM at 2560x1600, which is almost twice the resolution of a 24" screen. This was with Dragon Age II with all settings turned up except AA, high resolution texture pack installed, and a second 1920x1200 monitor running beside it.
Last, you didn't mention whether or not you're planning on grabbing a second HD6950 down the road- if you are, that definitely affects a few choices now; if you're not, you can save some cash up front. First on the PSU- if you're not going to add a second card, even a decent 450w unit will be overkill. Next, you can save on the board, as you don't need that second PCIe x8 slot; and third, you definitely don't need the 2GB card. If you are, then look for a 650w PSU (you'll run between 400-500w load depending on application and overclock), get the board you listed, and get the 2GB card, as there is some overhead associated with multi-GPU configurations.
