*Manofbuilds's parts are generally very good.
(In particular a good gaming system is best designed based on the i5-3570K and a Z77 1155 motherboard, and 8GB of DDR3 memory).
Points:
1) That Noctua NH-D14 cooler uses 3-pin Voltage-controlled fans. Most motherboards now only use PWM fans (or the fan speed can't be controlled).
2) I recommend this 3-slot card (overclock to 1000MHz). It will run quieter, even clocked at 1000MHz then any similar card due to its large, efficient cooler:
http://www.guru3d.com/articles_pages/asus_radeon_hd_7970_directcu_ii_review,24.html
3) I love 27" 2560x1440 monitors. If you decide to get one another option is the similar DELL monitor which has a zero-defects 3-year Warranty with next-day shipping and no cost to ship your monitor.
It also depends on what you can get and what is supported where you live but if possible this Dell is awesome:
http://accessories.us.dell.com/sna/productdetail.aspx?c=us&l=en&s=bsd&cs=04&sku=225-4015
4) Power Supply:
I recommend at least a 650W with sufficient connections, however there are likely better deals than the one listed. I like some of the Antec High Power models but do a little research and look for sales.
5) I agree on the Samsung 840 Pro 128GB, but get a 2TB or 3TB Hard Drive for games, C-Drive backup, Media etc.
6) If possible, get a Z77 1155 motherboard with Creative onboard audio. Alternatively get an Asus or Creative addon card. You don't need amazing speakers but spend at least $50 stereo or $100 surround (I dislike rear speakers as they are a pain to setup; if you get a subwoofer make sure the POWER switch is in one of the speakers not on the subwoofer).
Three value boards with great reviews (also compare current pricing, Warranties, customer reviews, and the BIOS interface):
http://www.tomshardware.com/reviews/z77-express-ivy-bridge-benchmark,3254-35.html
*If I had to pick, I'd get the Asrock Extreme 4.
7) Windows:
- Windows 8 64-bit OEM, and
- START8 from Stardock ($5)
*Windows 8 has many improvements over Windows 7 (faster boot, more secure, more reliable, better SSD support, improved memory manager, improved Windows Explorer..) however it gets a bad rep due to the stupid new interface. However that's easily fixed by getting START8.
I've been gaming with Windows 8 64-bit since release and also build PC's. I was unsure at first, but now can strongly recommend it over Windows 7 (again with START8 as well).