Suggestion for building a Gaming Rig

I am not familiar with India so here's a USD build you could ask the computer store if they are available.

PCPartPicker part list / Price breakdown by merchant

CPU: AMD FX-8320 3.5GHz 8-Core Processor ($139.99 @ SuperBiiz)
Motherboard: Gigabyte GA-990FXA-UD3 ATX AM3+ Motherboard ($115.99 @ SuperBiiz)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1866 Memory ($82.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($53.98 @ OutletPC)
Video Card: Sapphire Radeon R9 280 3GB Dual-X Video Card ($184.99 @ Newegg)
Case: Corsair 200R ATX Mid Tower Case ($39.99 @ Micro Center)
Power Supply: SeaSonic S12II 620W 80+ Bronze Certified ATX Power Supply ($68.98 @ Newegg)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer ($14.99 @ Amazon)
Total: $692.91
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-10-07 05:57 EDT-0400