Good Power Supply for this build?

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No! "CX" line is an entry level and highly overpriced PSU's, I would recommend you XFX 750W for less price, also 4x4GB RAM won't give any performance boost but 2x8GB 1866MHz CL9 RAM will give some performance boost!

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i7-4770K 3.5GHz Quad-Core Processor ($319.99 @ Newegg)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ OutletPC)
Motherboard: MSI Z87-G45 Gaming ATX LGA1150 Motherboard ($139.99 @ Micro Center)
Memory: G.Skill Ripjaws X Series 16GB (2 x 8GB) DDR3-1866 Memory ($134.99 @ Newegg)
Storage: Samsung 840 EVO...
No! "CX" line is an entry level and highly overpriced PSU's, I would recommend you XFX 750W for less price, also 4x4GB RAM won't give any performance boost but 2x8GB 1866MHz CL9 RAM will give some performance boost!

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i7-4770K 3.5GHz Quad-Core Processor ($319.99 @ Newegg)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ OutletPC)
Motherboard: MSI Z87-G45 Gaming ATX LGA1150 Motherboard ($139.99 @ Micro Center)
Memory: G.Skill Ripjaws X Series 16GB (2 x 8GB) DDR3-1866 Memory ($134.99 @ Newegg)
Storage: Samsung 840 EVO 120GB 2.5" Solid State Disk ($89.99 @ Amazon)
Storage: Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($81.78 @ Amazon)
Video Card: EVGA GeForce GTX 780 3GB Video Card ($489.99 @ NCIX US)
Case: NZXT Phantom (White) ATX Full Tower Case ($100.25 @ Amazon)
Power Supply: XFX 750W 80+ Bronze Certified ATX Power Supply ($79.99 @ NCIX US)
Total: $1466.95
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-04-08 12:05 EDT-0400)
 
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