Buy a single Sata cable as the mobo comes with one.
A full tower case, if you have never seen one, is HUGE. It will be as tall as your desk. They are enormous. Get a normal mid-tower. Building in a full tower is often harder because things have to reach further. I strongly recommend a mid-tower.
For fans, as long as you have 3 you are good to go. (front intake, top exhaust, rear exhaust) More fans DOES NOT mean a cooler computer.
Get this RAM:
http://pcpartpicker.com/part/gskill-memory-f312800cl9d8gbxl Order it today with the promo code.