I went a bit over your budget as i choose the GTX 770 which is quite a bit better then the R9 280. I also added a better CPU (although its an i3 it is better at running games).
PCPartPicker part list:
http://au.pcpartpicker.com/p/xJwJHx
Price breakdown by merchant: http://au.pcpartpicker.com/p/xJwJHx/by_merchant/
CPU: Intel Core i3-4160 3.6GHz Dual-Core Processor ($149.00 @ Centre Com)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($45.00 @ CPL Online)
Motherboard: ASRock H81 Pro BTC ATX LGA1150 Motherboard ($58.00 @ Scorptec)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($89.00 @ CPL Online)
Storage: Crucial MX100 128GB 2.5" Solid State Drive ($99.00 @ PCCaseGear)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($72.00 @ Centre Com)
Video Card: Gigabyte GeForce GTX 770 2GB WINDFORCE Video Card ($369.00 @ CPL Online)
Case: Cougar MX300 ATX Mid Tower Case ($49.00 @ CPL Online)
Power Supply: Corsair CX 600W 80+ Bronze Certified Semi-Modular ATX Power Supply ($111.99 @ Mwave Australia)
Total: $1041.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-04-23 14:11 EST+1000