Is my computer build good?

Solution
Ill save you some cash and increase your performance.
Much much higher quality PSU and higher quality mobo both for cheaper.
You can also get a cheaper mobo than this since you have a CPU that will not overclock. With the z97 however you can SLI.

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-4590 3.3GHz Quad-Core Processor ($189.95 @ SuperBiiz)
Motherboard: Gigabyte GA-Z97X-Gaming 5 ATX LGA1150 Motherboard ($95.99 @ SuperBiiz)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($54.89 @ OutletPC)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($46.89 @ OutletPC)
Video Card:...
Ill save you some cash and increase your performance.
Much much higher quality PSU and higher quality mobo both for cheaper.
You can also get a cheaper mobo than this since you have a CPU that will not overclock. With the z97 however you can SLI.

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-4590 3.3GHz Quad-Core Processor ($189.95 @ SuperBiiz)
Motherboard: Gigabyte GA-Z97X-Gaming 5 ATX LGA1150 Motherboard ($95.99 @ SuperBiiz)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($54.89 @ OutletPC)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($46.89 @ OutletPC)
Video Card: EVGA GeForce GTX 970 4GB FTW ACX 2.0 Video Card ($353.98 @ Newegg)
Case: Corsair 300R ATX Mid Tower Case ($59.99 @ Micro Center)
Power Supply: EVGA SuperNOVA GS 550W 80+ Gold Certified Fully-Modular ATX Power Supply ($64.99 @ NCIX US)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer ($14.98 @ OutletPC)
Operating System: Microsoft Windows 7 Home Premium SP1 OEM (64-bit) ($86.75 @ OutletPC)
Monitor: Acer G226HQLBbd 60Hz 21.5" Monitor ($121.72 @ Amazon)
Keyboard: Cooler Master CM Storm Devastator Gaming Bundle Wired Gaming Keyboard w/Optical Mouse ($27.99 @ Amazon)
Total: $1118.12
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-07-10 17:56 EDT-0400

or 4 more cores (hyperthreaded CPU.)
PCPartPicker part list / Price breakdown by merchant

CPU: Intel Xeon E3-1231 V3 3.4GHz Quad-Core Processor ($242.99 @ SuperBiiz)
Motherboard: Gigabyte GA-Z97X-Gaming 5 ATX LGA1150 Motherboard ($95.99 @ SuperBiiz)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($54.89 @ OutletPC)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($46.89 @ OutletPC)
Video Card: EVGA GeForce GTX 970 4GB FTW ACX 2.0 Video Card ($353.98 @ Newegg)
Case: Corsair 300R ATX Mid Tower Case ($59.99 @ Micro Center)
Power Supply: EVGA SuperNOVA GS 550W 80+ Gold Certified Fully-Modular ATX Power Supply ($64.99 @ NCIX US)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer ($14.98 @ OutletPC)
Operating System: Microsoft Windows 7 Home Premium SP1 OEM (64-bit) ($86.75 @ OutletPC)
Monitor: Acer G226HQLBbd 60Hz 21.5" Monitor ($121.72 @ Amazon)
Keyboard: Cooler Master CM Storm Devastator Gaming Bundle Wired Gaming Keyboard w/Optical Mouse ($27.99 @ Amazon)
Total: $1171.16
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-07-10 17:59 EDT-0400
 
Solution

Xemko

Admirable
PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-4590 3.3GHz Quad-Core Processor ($189.95 @ SuperBiiz)
Motherboard: Gigabyte GA-Z97X-Gaming 5 ATX LGA1150 Motherboard ($95.99 @ SuperBiiz)
Memory: G.Skill Ares Series 8GB (2 x 4GB) DDR3-2133 Memory ($58.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($46.89 @ OutletPC)
Video Card: MSI Radeon R9 390 8GB Video Card ($329.98 @ SuperBiiz)
Case: Corsair 300R ATX Mid Tower Case ($59.99 @ Micro Center)
Power Supply: XFX Core Edition 650W 80+ Bronze Certified ATX Power Supply ($39.99 @ Newegg)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer ($14.98 @ OutletPC)
Operating System: Microsoft Windows 7 Home Premium SP1 OEM (64-bit) ($86.75 @ OutletPC)
Monitor: Acer G226HQLBbd 60Hz 21.5" Monitor ($121.72 @ Amazon)
Keyboard: Cooler Master CM Storm Devastator Gaming Bundle Wired Gaming Keyboard w/Optical Mouse ($27.99 @ Amazon)
Total: $1073.22
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-07-10 18:07 EDT-0400

or

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Xeon E3-1231 V3 3.4GHz Quad-Core Processor ($242.99 @ SuperBiiz)
Motherboard: Gigabyte GA-Z97X-Gaming 5 ATX LGA1150 Motherboard ($95.99 @ SuperBiiz)
Memory: G.Skill Ares Series 8GB (2 x 4GB) DDR3-2133 Memory ($58.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($46.89 @ OutletPC)
Video Card: MSI Radeon R9 390 8GB Video Card ($329.98 @ SuperBiiz)
Case: Corsair 300R ATX Mid Tower Case ($59.99 @ Micro Center)
Power Supply: XFX Core Edition 650W 80+ Bronze Certified ATX Power Supply ($39.99 @ Newegg)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer ($14.98 @ OutletPC)
Operating System: Microsoft Windows 7 Home Premium SP1 OEM (64-bit) ($86.75 @ OutletPC)
Monitor: Acer G226HQLBbd 60Hz 21.5" Monitor ($121.72 @ Amazon)
Keyboard: Cooler Master CM Storm Devastator Gaming Bundle Wired Gaming Keyboard w/Optical Mouse ($27.99 @ Amazon)
Total: $1126.26
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-07-10 18:06 EDT-0400