OS 7 Ultimate x64 CPU i5-2500k Motherboard Asus P8P67 Pro Memory 8GB G.Skill Ripjaws X F3-12800CL7D-8GBXH 1866MHz 8-9-8-24 Graphics Card EVGA GTX 570 SC Sound Card X-Fi Titanium Fatality Monitor(s) Displays Samsung S27A550H 27" LED Screen Resolution 1920x1080
Keyboard MS Natural Elite 4000 Ergonomic Mouse Logitech G500 PSU PC Power & Cooling Silencer 760 Case Lian Li Lancool K62 Cooling Thermalright Venomous X Black/Scythe S-Flex/Shin-Etsu X23 Hard Drives OCZ Vertex 3 120GB.
1TB Samsung F3.
2TB Samsung F4. Internet Speed 6MB/768 Other Info Logitech Z-5500 505 watts.
D-Link DGL-4500.
Tripp-Lite Smart Pro 1500.
Cases are made for specific sized motherboards, ATX, mATX, mini-ITX etc. That is an ATX board so you would want an ATX case and since this is a gaming PC you'd want a gaming case with good airflow. I'd recommend the HAF X. The USB connections have headers you attach to the board. You'll find some Build Your Own PC guides on youtube (in 720p) and by googling.
System Manufacturer/Model Number Acer Aspire 5536 OS windows 7 CPU 2.1 Motherboard Acer Memory 3GB Graphics Card ATI Radeon Sound Card Built in 5.1 HD Screen Resolution 15.4"