Hi, guys. I am building my new PC from 0 and stacked on ram module/s i should choose. It is certain, that i will have 2*gtx780 and 3770 or 4770(have not deciced yet), and 2560 monitor. The main purpose is gaming, but i also want my PC be quick at different tasks.... So, how much (8,16 or 32) of ram should i buy and should i pay more for higher speed(like 2400 or so). I also play to use liquid cooling and OC my system. Thanks.