Hi,
I built this custom Desktop PC few years ago with all the parts purchased from TigerDirect and assembled together by one of their technician. I needed it during my University days but it's not being used now as I have another PC at home. With all the parts put together, it cost me roughly $900. The Desktop case is a midsize ATX so it can fit in small spaces. I currently have Windows 8.1 Pro installed on it. I have included an image of the main components including the Motherboard, CPU, RAM, Drives, Graphics Card, etc.
Specs:
Custom built Desktop PC
Intel Core 2 Quad Q600 (2.4 Ghz)
4 GB of Dual Channel DDR2 RAM
1024MB ATI AMD Radeon HD 5450 Graphics Card
500 GB Seagate ST350041 hard disk drive
HP lightscribe DVD burner and drive
Audio: Realtek High Definition Audio
Operating System and Software
Windows 8.1 Pro (64 bit)
Microsoft Office Professional Plus 2013
Feel free to ask me any questions you have.