Even with 970 chipset, it is difficult to bring it under 900
PCPartPicker part list:
http://au.pcpartpicker.com/p/FTLWBm
Price breakdown by merchant: http://au.pcpartpicker.com/p/FTLWBm/by_merchant/
CPU: AMD FX-8320 3.5GHz 8-Core Processor ($185.00 @ Mwave Australia)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($39.00 @ Mwave Australia)
Motherboard: Gigabyte GA-970A-D3P ATX AM3+/AM3 Motherboard ($106.00 @ CPL Online)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($99.00 @ Mwave Australia)
Storage: Samsung 840 EVO 120GB 2.5" Solid State Drive ($95.00 @ CPL Online)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($67.00 @ CPL Online)
Video Card: MSI Radeon R9 280 3GB TWIN FROZR Video Card ($249.00 @ PCCaseGear)
Case: Cooler Master Force 500 ATX Mid Tower Case ($49.00 @ CPL Online)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($83.12 @ Mwave Australia)
Total: $972.12
Prices include shipping, taxes, and discounts when available