You say all you need is a Processor, Ram, Motherboard and Graphics Card so here's what I came up with.
CPU: AMD FX-6300 3.5GHz 6-Core Processor | Great performance for the price.
Motherboard: Asus M5A97 LE R2.0 ATX AM3+ Motherboard | A cheap motherboard with decent features.
Memory: Kingston HyperX 4GB (2 x 2GB) DDR3-1866 Memory | Cheap memory set, 4GB will be plenty for you.
Video Card: Galaxy GeForce GT 640 1GB Video Card | Cheap GFX Card with great performance for what you will be doing.