What leds are the best to buy?

i just bought a black knight xcm with pre cut window for my xbox 360(falcon)and when i was putting it on because the wires run through the fan shroud i pulled it by accident and 3 of the wires came of, and now the lights dont work so i took the lights completely of, so now i wanna just put my own leds in, i wanna have 6 on the bottem and top of the chis, ino where to get a 12 volt power source but im wondering whats the best, brightest leds to buy that will last the longest..thanx in advance