New to computers, need help with choosing computer parts

[Darkflow]

Hello, I am currently new at building computer. One of my friends had told me that usually building a desktop is better than buying a premade desktop. And that I should refer to this site for help. I am wondering if that is true and if the build I am attempting to make based off of the basic research I have done and the info that he has given, would be a decent gaming computer for the price and if there are any better or cheaper ways to build the computer.
I have a $2000 budget but about $400 was left unused in this build because I may be buying a keyboard, headphones, and a mouse but this is entirely optional and I can use in in making the computer, also these parts are all from newegg
Here are the parts:

• 
  Cooler Master HAF 932 Advanced - High Air Flow Full Tower Computer Case with USB 3.0 and All-Black Interior
  
  APEVIA CF12SL-URED 120mm Red LED Cooling Fan (x3)
  
  MSI Z87-G45 Gaming LGA 1150 Intel Z87 HDMI SATA 6Gb/s USB 3.0 ATX Pro Gaming with Killer Networking & Sound Blaster Intel Motherboard
  
  EVGA SuperClocked 02G-P4-2662-KR GeForce GTX 660 2GB 192-bit GDDR5 PCI Express 3.0 x16 HDCP Ready SLI Support Video Card (x2) (2GB)
  
  CORSAIR RM Series RM1000 1000W ATX12V v2.31 and EPS 2.92 80 PLUS GOLD Certified Full Modular Active PFC Power Supply
  
  Intel Core i5-4670K Haswell 3.4GHz LGA 1150 84W Quad-Core Desktop Processor Intel HD Graphics BX80646I54670K
  
  G.SKILL Ripjaws X Series 16GB (2 x 8GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-1600C9D-16GXM
  
  Seagate Barracuda ST2000DM001 2TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
  
  ASUS DRW-24B1ST/BLK/B/AS Black SATA 24X DVD Burner - Bulk - OEM
  
  Microsoft Windows 7 Professional SP1 64-bit - OEM
  
  ARCTIC Freezer 7 Pro Rev. 2, CPU Cooler - Intel & AMD, Multi-Directional Mount, 92mm PWM Fan
  

Thank you for your time.

 

[shortstuff_mt]

It's not a very good build for gaming. 16GB is overkill for gaming, a GTX 660 is way too weak for this caliber of machine, and 1000W is way too much for the PSU. Here's my suggestions.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor ($219.99 @ Amazon)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ OutletPC)
Motherboard: Gigabyte GA-Z87X-UD3H ATX LGA1150 Motherboard ($139.99 @ Microcenter)
Memory: G.Skill Sniper Series 8GB (2 x 4GB) DDR3-2133 Memory ($84.99 @ Newegg)
Storage: Samsung 840 Pro Series 128GB 2.5" Solid State Disk ($114.99 @ Amazon)
Storage: Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($87.96 @ Amazon)
Video Card: Asus GeForce GTX 780 3GB Video Card ($519.99 @ Amazon)
Case: Corsair 400R ATX Mid Tower Case ($89.99 @ Microcenter)
Power Supply: Corsair Professional 850W 80+ Gold Certified Semi-Modular ATX Power Supply ($149.99 @ Microcenter)
Optical Drive: LG GH24NSB0 DVD/CD Writer ($15.99 @ Microcenter)
Operating System: Microsoft Windows 8.1 - OEM (64-bit) ($99.98 @ OutletPC)
Total: $1553.84
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-02-15 01:06 EST-0500)

 

[dmmbbs]

What are you going to do with that 1000W power supply, run a vacuum cleaner? Reduce it. Why GTX 660 when you can afford higher and newer? Definitely buy an SSD. And buy at least a Hyper 212 evo if you wan to overclock.

 

[woltej1]

PCPartPicker part list: http://pcpartpicker.com/p/2Tu4O
Price breakdown by merchant: http://pcpartpicker.com/p/2Tu4O/by_merchant/
Benchmarks: http://pcpartpicker.com/p/2Tu4O/benchmarks/

CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor ($219.99 @ Amazon)
CPU Cooler: Noctua NH-D14 65.0 CFM CPU Cooler ($74.99 @ Mwave)
Motherboard: Asus Maximus VI Hero ATX LGA1150 Motherboard ($197.27 @ TigerDirect)
Memory: G.Skill Sniper Series 8GB (2 x 4GB) DDR3-2133 Memory ($84.99 @ Newegg)
Storage: Samsung 840 EVO 500GB 2.5" Solid State Disk ($319.99 @ Amazon)
Storage: Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($87.96 @ Amazon)
Video Card: MSI GeForce GTX 780 3GB Video Card ($545.98 @ SuperBiiz)
Case: Cooler Master HAF 932 Advanced ATX Full Tower Case ($119.99 @ Newegg)
Power Supply: Corsair Professional 850W 80+ Gold Certified Semi-Modular ATX Power Supply ($149.99 @ Microcenter)
Optical Drive: LG GH24NSB0 DVD/CD Writer ($15.99 @ Microcenter)
Operating System: Microsoft Windows 8.1 - OEM (64-bit) ($99.98 @ OutletPC)
Total: $1917.12
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-02-15 01:21 EST-0500)

If you got 2 grand to spend this list has everything you would need. I based it off the above members but added a much better cooler, one of the top mobos for overclocking, a good and big ssd so all your games can be on it at once and a better tower to keep it cool. This build isn't made to be money efficient, but very high quality.