AMD Athlon X4 760K = $84.74
Gigabyte GA-F2A88XM-D3H = $64.99
Crucial Ballistix Sport 8GB (2x 4GB) DDR3-1600 1.35v = $76.99
MSI Radeon R7 265 OC 2GB = $149.99
Crucial MX100 128GB = $74.99 (IMO I'd replace this with a cheaper hard drive, who the forget normally needs an SSD anyways.)
Fractal Design Core 1000 = $39.99
Corsair CX430 430W = $44.99 (plus $20 MIR)
Asus VE228H 21.5" = $139.99 (plus $10 MIR)
Logitech MK120 Wired Desktop = $14.99
Logitech X-140 2.0 = $26.99
Total = $718.65 ($688.65 after rebates)
This includes monitor, speakers, mouse, keyboard, case, pretty much everything.
http://arstechnica.com/gadgets/2014/08/ars-technica-system-guide-august-2014/