For PSU, you want your average consumption to fall inline with about 50-60% of the PSU's maximum. That's where they are typically most efficient, plus you have headroom for spikes under full load.
Judging by your setup listed, I would think something around 600-650W would be good. Along those lines I like the Cooler Master Silent Pro M2 620W 80 PLUS Bronze Semi Modular (it also happens to be very quiet for a mid range PSU).
For a CPU Cooler, I would go with something like one of the following:
Xigmatek Gaia - $30
Xigmatek Loki - $25
Cooler Master Hyper 212 EVO - $30
Any of those should work just fine.
Also, if you're just gaming, you may not need 16 GB of RAM. If you can afford it, and don't have to compromise your build elsewhere, then by all means get it. However, if you're skimping somewhere else to get that much RAM 8 GB is typically enough.
What MB were you looking at?
EDIT:
What about this:
PCPartPicker part list:
http://pcpartpicker.com/p/1PRru
Price breakdown by merchant: http://pcpartpicker.com/p/1PRru/by_merchant/
Benchmarks: http://pcpartpicker.com/p/1PRru/benchmarks/
CPU: Intel Core i7-4770K 3.5GHz Quad-Core Processor ($324.97 @ SuperBiiz)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ Outlet PC)
Motherboard: Asus Z87-PRO ATX LGA1150 Motherboard ($174.99 @ SuperBiiz)
Memory: Mushkin Blackline 8GB (2 x 4GB) DDR3-1600 Memory ($62.99 @ NCIX US)
Storage: Corsair Force Series GT 120GB 2.5" Solid State Disk ($128.99 @ Amazon)
Storage: Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($84.98 @ Outlet PC)
Video Card: Gigabyte GeForce GTX 680 4GB Video Card ($532.99 @ SuperBiiz)
Case: Xigmatek Recon ATX Mid Tower Case ($29.99 @ Newegg)
Power Supply: Cooler Master Silent Pro M2 620W 80 PLUS Bronze Certified ATX12V Power Supply ($49.99 @ Newegg)
Optical Drive: LG GH24NS90 DVD/CD Writer ($15.16 @ Mwave)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($87.99 @ NCIX US)
Total: $1523.02
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-10-17 10:12 EDT-0400)
Personally, for the money you're spending on the GTX 680, I would look at the Sapphire R9-280X Toxic Edition (3 GB) or Asus R9-280X DCUII TOP (3 GB) which are less money, and outpace the GTX 680 and GTX 770 both.
That build will look like this:
PCPartPicker part list:
http://pcpartpicker.com/p/1PRuy
Price breakdown by merchant: http://pcpartpicker.com/p/1PRuy/by_merchant/
Benchmarks: http://pcpartpicker.com/p/1PRuy/benchmarks/
CPU: Intel Core i7-4770K 3.5GHz Quad-Core Processor ($324.97 @ SuperBiiz)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ Outlet PC)
Motherboard: Asus Z87-PRO ATX LGA1150 Motherboard ($174.99 @ SuperBiiz)
Memory: Mushkin Blackline 8GB (2 x 4GB) DDR3-1600 Memory ($62.99 @ NCIX US)
Storage: Corsair Force Series GT 120GB 2.5" Solid State Disk ($128.99 @ Amazon)
Storage: Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($84.98 @ Outlet PC)
Video Card: Sapphire Radeon R9 280X 3GB Video Card ($365.91 @ Newegg)
Case: Xigmatek Recon ATX Mid Tower Case ($29.99 @ Newegg)
Power Supply: Cooler Master Silent Pro M2 620W 80 PLUS Bronze Certified ATX12V Power Supply ($49.99 @ Newegg)
Optical Drive: LG GH24NS90 DVD/CD Writer ($26.90 @ Amazon)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($87.99 @ NCIX US)
Total: $1367.68
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-10-17 10:15 EDT-0400)