You have some serious misconceptions
LMGTFY - http://www.guru3d.com/articles_pages/corsair_dominator_platinum_2133_mhz_ddr3_review,10.html
I dont think so, as Linus said in the video that i linked, for benching and some applications then maybe but for gaming you actually get less performance the higher you speed goes. Listen to what he says as more latency is introduced the higher the ram speed. The link to guru3d just shows benchies, not games man. Its all about the games and the scores do not lie. 1600mhz is still the sweetspot. Then again we are talking milleseconds so no matter what you buy and use your not gonna notice it.
Dont kid yourself that your getting much faster speed for your money when ytou buy 2600mhz ram because basically your not, infact for gaming its a slight decrease in performance. DD4 will change all of this on Haswell E.
And Kaapstad OCUK sent you a used tower at the price of a brand new one? Thats disgusting, puts me off from buying anything from here if im honest.