This is all you need
PCPartPicker part list:
http://pcpartpicker.com/p/kpsWjX
Price breakdown by merchant: http://pcpartpicker.com/p/kpsWjX/by_merchant/
CPU: Intel Core i3-4150 3.5GHz Dual-Core Processor ($99.99 @ NCIX US)
Motherboard: ASRock H97M Anniversary Micro ATX LGA1150 Motherboard ($66.99 @ SuperBiiz)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($64.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($49.88 @ OutletPC)
Case: Cooler Master N200 MicroATX Mid Tower Case ($39.99 @ Newegg)
Power Supply: Antec EarthWatts Green 380W 80+ Bronze Certified ATX Power Supply ($29.99 @ Newegg)
Total: $351.83
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-12-28 00:08 EST-0500
If you wanted to add anything to it, I recommend a 120-128GB ssd for $60-70
AMD A10s make excellent general use "family" PCs too
PCPartPicker part list:
http://pcpartpicker.com/p/dHMDf7
Price breakdown by merchant: http://pcpartpicker.com/p/dHMDf7/by_merchant/
CPU: AMD A10-7700K 3.4GHz Quad-Core Processor ($112.25 @ TigerDirect)
Motherboard: Asus A88XM-A Micro ATX FM2+ Motherboard ($52.99 @ SuperBiiz)
Memory: Mushkin Redline 8GB (2 x 4GB) DDR3-1866 Memory ($63.98 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($49.88 @ OutletPC)
Case: Cooler Master N200 MicroATX Mid Tower Case ($39.99 @ Newegg)
Power Supply: Antec EarthWatts Green 380W 80+ Bronze Certified ATX Power Supply ($29.99 @ Newegg)
Total: $349.08
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-12-28 00:13 EST-0500