How Is My Build?

Solution
If it's gaming you're going for, and you're only getting a single GTX 780 on that budget, you're doing it wrong.

I would drop the whole thing and do something like this:

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-4690K 3.5GHz Quad-Core Processor ($234.99 @ NCIX US)
CPU Cooler: NZXT Kraken X61 106.1 CFM Liquid CPU Cooler ($136.99 @ SuperBiiz)
Motherboard: ASRock Z97 EXTREME6 ATX LGA1150 Motherboard ($149.99 @ Newegg)
Memory: G.Skill Ares Series 8GB (2 x 4GB) DDR3-2400 Memory ($86.99 @ Newegg)
Storage: Samsung 840 EVO 120GB 2.5" Solid State Drive ($85.99 @ Amazon)
Storage: Seagate Barracuda 1TB 3.5"...

g-unit1111

Titan
Moderator
If it's gaming you're going for, and you're only getting a single GTX 780 on that budget, you're doing it wrong.

I would drop the whole thing and do something like this:

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-4690K 3.5GHz Quad-Core Processor ($234.99 @ NCIX US)
CPU Cooler: NZXT Kraken X61 106.1 CFM Liquid CPU Cooler ($136.99 @ SuperBiiz)
Motherboard: ASRock Z97 EXTREME6 ATX LGA1150 Motherboard ($149.99 @ Newegg)
Memory: G.Skill Ares Series 8GB (2 x 4GB) DDR3-2400 Memory ($86.99 @ Newegg)
Storage: Samsung 840 EVO 120GB 2.5" Solid State Drive ($85.99 @ Amazon)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($53.99 @ Amazon)
Video Card: EVGA GeForce GTX 780 3GB Superclocked ACX Video Card (2-Way SLI) ($504.99 @ SuperBiiz)
Video Card: EVGA GeForce GTX 780 3GB Superclocked ACX Video Card (2-Way SLI) ($504.99 @ SuperBiiz)
Case: NZXT H440 (White/Black) ATX Mid Tower Case ($98.99 @ NCIX US)
Power Supply: EVGA SuperNOVA 1000 P2 1000W 80+ Platinum Certified Fully-Modular ATX Power Supply ($169.99 @ NCIX US)
Operating System: Microsoft Windows 8.1 - 64-bit (OEM) (64-bit) ($96.99 @ Best Buy)
Total: $2124.89
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-09-16 21:04 EDT-0400

That gives you $400 for monitor, keyboard, and mouse.
 
Solution

You need to add a mouse and a keyboard.