Help needed in cooling the new system and picking the right parts

I am building a new system which will consist from Asus Rampage x 79, I7 3960x, either Gforce 690 or 1 680 later followed by another 680, 2 *250gb SSD's Crucial or similar, Segate Baracuda 3tb, Crosair vengence 1600 4*4GB or 8*4 (need advice on that as don't think that I would be able to use 32gb fully, so it seems like wasted money), case NZXT 800 (or any other, I am open to suggestions), have not decided on the PSU as am not certain how much power will I need. And now for the hard part - how to keep it all cooled? Would it be possible to do it with fans or a cooling system would work better? Which parts to go for in terms of case, fans and CS? All suggestions will be appreciated. I already have 3960x and the Segate HDD. The Pc will be used for games, video and data editing.