That's excessive for a crimper. Here's one that looks similar to my old one that worked 100% of the time for all things molex:

https://www.amazon.com/Waldom-Electronics-W-HT-1919-CRIMPING-MOLEX/dp/B001GMYU9S/ref=sr_1_7?ie=UTF8&qid=1481238546&sr=8-7&keywords=molex+crimper+tool

u/AnziD, here's parts:

Socket holder (need 1):

http://www.mouser.com/ProductDetail/TE-Connectivity-AMP/1-480424-0/?qs=ko0lFLRalIOE%2FKdC2RXHBg%3D%3D

Socket (need 4):

http://www.mouser.com/ProductDetail/TE-Connectivity-AMP/60619-1/?qs=pn%2Fzyis3XjGFb4jHYYY9Mg%3D%3D

Pin housing (need 1):

http://www.mouser.com/ProductDetail/TE-Connectivity-AMP/1-480426-0/?qs=ko0lFLRalINhw2W1MBRjEg%3D%3D

Pins (need 4):

http://www.mouser.com/ProductDetail/TE-Connectivity/60620-1/?qs=pn%2Fzyis3XjHkDeV60Xt%252btg%3D%3D

Additionally, need sheathing, heat shrink to secure sheathing to bundle, and 50' wire. In my earlier post I mentioned 18AWG should be sufficient, however, the pins and sockets listed are rated for up to 13A and that got me researching more. I looked the the NZXT site and it says in input of 5V, and a google search found a maximum 3A draw. In order to get close to the 3% drop along 12 feet, you're going to want 14AWG wire. Unfortunate side effect of running low voltage, I'm afraid. Going to be a thick bundle, but still workable and the pins will accept it. An auto parts store should have that gauge in stranded copper wire, as my brief Amazon search wasn't too helpful to me.

EDIT:

Buy more pins and sockets than just the amount you need, as mistakes do happen. Probably want to shoot for double on the mouser order so you're only paying shipping once.