Here is an AMD approach, and it has a stronger APU than the intel builds, but I'm not sure about single core perfomance but it will be good for a fast everyday computer.
PCPartPicker part list:
http://au.pcpartpicker.com/p/NZ8QLk
Price breakdown by merchant: http://au.pcpartpicker.com/p/NZ8QLk/by_merchant/
CPU: AMD A8-6600K 3.9GHz Quad-Core Processor ($109.00 @ CPL Online)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($39.00 @ Mwave Australia)
Motherboard: ASRock FM2A88X Extreme4+ ATX FM2+ Motherboard ($69.00 @ PCCaseGear)
Memory: Crucial 8GB (2 x 4GB) DDR3-1600 Memory ($88.00 @ CPL Online)
Storage: Samsung 840 EVO 120GB 2.5" Solid State Drive ($79.00 @ CPL Online)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($62.00 @ Centre Com)
Case: NZXT Phantom 410 (White) ATX Mid Tower Case ($125.00 @ CPL Online)
Power Supply: Antec High Current Gamer 620W 80+ Bronze Certified Semi-Modular ATX Power Supply ($109.00 @ CPL Online)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) ($115.00 @ CPL Online)
Total: $795.00
Prices include shipping, taxes, and discounts when available
EDIT: Sorry forgot you needed a keyboard, updated build:
PCPartPicker part list:
http://au.pcpartpicker.com/p/Pd6QLk
Price breakdown by merchant: http://au.pcpartpicker.com/p/Pd6QLk/by_merchant/
CPU: AMD A8-6600K 3.9GHz Quad-Core Processor ($109.00 @ CPL Online)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($39.00 @ Mwave Australia)
Motherboard: ASRock FM2A88X Extreme4+ ATX FM2+ Motherboard ($69.00 @ PCCaseGear)
Memory: Crucial 8GB (2 x 4GB) DDR3-1600 Memory ($88.00 @ CPL Online)
Storage: Kingston SSDNow V300 Series 60GB 2.5" Solid State Drive ($58.00 @ Mwave Australia)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($62.00 @ Centre Com)
Case: NZXT Phantom 410 (White) ATX Mid Tower Case ($125.00 @ CPL Online)
Power Supply: Antec High Current Gamer 620W 80+ Bronze Certified Semi-Modular ATX Power Supply ($109.00 @ CPL Online)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) ($115.00 @ CPL Online)
Keyboard: Cooler Master CM Storm Devastator Gaming Bundle Wired Gaming Keyboard w/Optical Mouse ($45.00 @ CPL Online)
Total: $819.00
Prices include shipping, taxes, and discounts when available