CPU: Intel Pentium G3258
Motherboard: Any cheap H81 motherboard
Ram: 1x4GB DDR3, try to aim for 1600mhz and above
Storage: 1TB SATA HDD
Power supply: Good quality PSU around 550W.
Case: Any midtower or micro atx case. Try to look at the inside of the case before you buy it to see if it has slots where you can hide your cables for good cable management.
OS: Win 8.1