From what i've been seeing while trying to make my own kit, it seems that aquamist and aem are the two main options. And boy, once you add a failsafe, for the price it starts making more sense to just get the full aquamist kit. I've never heard anything saying it's smarter to make your own kit.
So far i've got a pump, pump bracket, upgraded snow solenoid, a mafu controller, and throttle pipe. Still need nozzles (thinking 225ml with filters), line, a y fitting, tank, two check-valves, and a throttle spacer. think thats it. oh, and a failsafe. lol
i'm also going to try running it on a race tune.