CPU: Intel Core i5-4590 3.3GHz Quad-Core Processor ($179.95 @ SuperBiiz) <--- can't be overclocked!
Motherboard: Gigabyte GA-Z97-HD3 ATX LGA1150 Motherboard ($69.10 @ SuperBiiz) <--- yuck!
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($59.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($44.10 @ SuperBiiz)
Video Card: Sapphire Radeon R9 290 4GB Tri-X OC Video Card ($253.98 @ Newegg)
Case: Cougar Evolution ATX Mid Tower Case ($71.10 @ SuperBiiz)
Power Supply: Corsair CX 600W 80+ Bronze Certified Semi-Modular ATX Power Supply ($49.99 @ Newegg) <---- yuck!
Optical Drive: Samsung SH-224DB/RSBS DVD/CD Writer ($13.99 @ Newegg)
Wireless Network Adapter: Asus PCE-N15 802.11b/g/n PCI-Express x1 Wi-Fi Adapter ($17.00 @ SuperBiiz)
Total: $746.20
You need a good quality 650W power supply eg Seasonic G 650 or XFX650.
Get a good H97 mobo. Not a crook Z97.
See
http://www.tomshardware.com/forum/id-2383217/motherboard-tier-list-h97-chipset.html
eg http://pcpartpicker.com/parts/compare/asrock-motherboard-fatal1tyh97performance%2Casus-motherboard-h97plus%2Casus-motherboard-h97progamer/