Under $700 Gaming computer?

[Bananabombs]

Hello, I need some help with picking out parts for my computer and am interested in building my first. However, I am not sure what are the components I need.
Here is what I already have in mind from searching around in Amazon.

• 
  AMD A8-5600K APU 3.6Ghz Processor AD560KWOHJBOX
  
  
  Thermaltake Smart Standard 650W 80 PLUS Bronze ATX12V 2.3 Power Supply SP-650P
  
  MSI AMD Radeon R9 270X Gaming 2GB GDDR5 2DVI/HDMI/Disp​layPort PCI-Express Video Card
  
  MSI Computer Corp. A55M-E35 Micro ATX DDR3 1600 FM2 Motherboards
  
  Seagate Barracuda 1 TB HDD SATA 6 Gb/s NCQ 64MB Cache 3.5-Inch Internal Bare Drive ST1000DM003
  
  Kingston HyperX Blu 8GB (1x8 GB Module) 1600MHz 240-pin DDR3 Non-ECC CL10 Desktop Memory KHX1600C10D3B1​/8G
  
  Windows 7 Home Premium SP1 64bit, System Builder OEM DVD 1 Pack (New Packaging)
  
  Asus 24x DVD-RW Serial-ATA Internal OEM Optical Drive DRW-24B1ST (Black)
  
  Sentey ATX Mid Tower Case with No Power Supply, Sandy Matte Black GS-6010 PLUS - COBRA

Is this ok or is their any way to make this a bit better?

Edit: I am also trying to save money so yeah..
And I heard building is better than buying a built one since more bang for your buck and whatnot.

 

[Tsurugan]

Are you considering buying a whole new unit at all?
Cybertron PC sells some pretty nice quality computers. The best part is that they keep dropping in price.
I recently bought a Cybertron and im happy with it.Here are a few specs

8 GB RAM
AMD FX(tm)-4130 Quad Core Processor 3.80 GHz
64bit Op System
Windows 8.1

Im not quite sure what model this is, but it has a blue side panel with led lights. Its somewhere in the 500$-650$ range.

 

[TechCIDLC]

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i3-4130 3.4GHz Dual-Core Processor ($109.98 @ SuperBiiz)
Motherboard: Gigabyte GA-H97-D3H ATX LGA1150 Motherboard ($99.99 @ Amazon)
Memory: Crucial Ballistix Sport 8GB (2 x 4GB) DDR3-1600 Memory ($77.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($54.98 @ OutletPC)
Video Card: MSI Radeon R9 270X 2GB TWIN FROZR Video Card ($159.99 @ Newegg)
Case: Corsair SPEC-01 RED ATX Mid Tower Case ($34.99 @ NCIX US)
Power Supply: SeaSonic S12II 520W 80+ Bronze Certified ATX Power Supply ($59.99 @ Amazon)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($16.98 @ OutletPC)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) ($89.98 @ OutletPC)
Total: $704.87
Prices include shipping, taxes, and discounts when available

 

[Bananabombs]

I also discovered pcpartpicker and decided on these component's.
Please know this is mainly for gaming and my first build so i won't know much of compatibility or possible performance.

http://pcpartpicker.com/user/Bananabombz/saved/xtm323