A system with a GTX 690 needs a recommended 620w power supply. A 650w power supply from Corsair, Seasonic, PC Power and Cooling, XFX, Silverstone, Enermax, OCZ or Antec will assure you are fine.http://www.realhardtechx.com/index_archivos/Page362.htm
As for RAM get 1.5v DDR3 1600 cas 9-9-9-24. Either Corsair Vengance or GSkill Ripjaws X would be my recommendation. Both are very good and both have a lifetime warranty. Go with whatever is cheaper.