How many watts do I need for my build?

for any max overclock on air for a cpu and single gpu, 550w or up would be fine. i changed some things.

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-4690K 3.5GHz Quad-Core Processor ($219.95 @ SuperBiiz)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($28.75 @ OutletPC)
Motherboard: ASRock Z97 PRO4 ATX LGA1150 Motherboard ($96.48 @ Newegg)
Memory: Crucial Ballistix Sport 8GB (2 x 4GB) DDR3-1600 Memory ($64.97 @ OutletPC)
Storage: Crucial MX100 128GB 2.5" Solid State Drive ($62.99 @ Amazon)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($48.88 @ OutletPC)
Video Card: MSI GeForce GTX 970 4GB Twin Frozr V Video Card ($349.99 @ Amazon)
Case: Fractal Design Define R4 (Black Pearl) ATX Mid Tower Case ($79.99 @ Newegg)
Power Supply: Antec High Current Gamer 620W 80+ Bronze Certified Semi-Modular ATX Power Supply ($59.99 @ NCIX US)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($18.75 @ OutletPC)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) ($89.75 @ OutletPC)
Monitor: Asus VX238H 23.0" Monitor ($139.99 @ Micro Center)
Case Fan: Fractal Design FD-FAN-SSR2-140 66.0 CFM 140mm Fan ($13.97 @ OutletPC)
Total: $1274.45
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-01-31 18:29 EST-0500