Mid high end gaming rig

[JamesJoule]

so i wanna build a new pc after selling my old one .. my budget is around 700 $ and ofc cheaper is better .. i need advice on cpu . gpu . motherboard and ram
also i have a 450watt power supply . do i need to get a new one ??
thanks in advance

 

[DeadGraphics]

if you could tell us the brand of the Power Supply that would be great,
PCPartPicker part list: http://pcpartpicker.com/p/srJ8bv
Price breakdown by merchant: http://pcpartpicker.com/p/srJ8bv/by_merchant/

CPU: AMD FX-6300 3.5GHz 6-Core Processor ($109.99 @ Newegg)
Motherboard: MSI 970A-G43 ATX AM3+ Motherboard ($69.99 @ Micro Center)
Memory: Crucial Ballistix Sport 8GB (2 x 4GB) DDR3-1600 Memory ($74.99 @ Micro Center)
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 200R ATX Mid Tower Case ($39.99 @ Newegg)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($55.98 @ SuperBiiz)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($16.98 @ OutletPC)
Operating System: Microsoft Windows 8.1 - 64-bit (OEM) (64-bit) ($94.98 @ OutletPC)
Total: $677.87
Prices include shipping, taxes, and discounts when available <--- This build if you have a monitor

 

[DeadGraphics]

PCPartPicker part list: http://pcpartpicker.com/p/3PyXJx
Price breakdown by merchant: http://pcpartpicker.com/p/3PyXJx/by_merchant/

CPU: Intel Pentium G3220 3.0GHz Dual-Core Processor ($59.99 @ Newegg)
Motherboard: MSI H81M-P33 Micro ATX LGA1150 Motherboard ($49.99 @ Mwave)
Memory: Crucial Ballistix Sport 8GB (2 x 4GB) DDR3-1600 Memory ($74.99 @ Micro Center)
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 200R ATX Mid Tower Case ($39.99 @ Newegg)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($55.98 @ SuperBiiz)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($16.98 @ OutletPC)
Operating System: Microsoft Windows 8.1 - 64-bit (OEM) (64-bit) ($94.98 @ OutletPC)
Monitor: BenQ GW2255 60Hz 21.5" Monitor ($107.60 @ Amazon)
Total: $715.47
Prices include shipping, taxes, and discounts when available <-------- This one if you have no monitor