Which build is better?

This will do, included a matx, but this one is better, it can support any fx cpu, and it has 4+1 power phase design with the vrm cooled, it's a good board for the price, lowered the cooler, still it's a good cooler for the price, with the price of the monitor(and a good one) and the 7870.
http://pcpartpicker.com/p/JJ8y

Get the case in ncix for 49.99$ before mir, and you'll get free shipping with the ram.
The XFX 550 Core edition is a better psu made by seasonic, the CX is the entry level of psus from corsair and made by channel well.
The corsair case is better too.