The Nano system will need refills, just like the nitrous
itself. But the Fire & Ice will probably have a high amperage draw. I personally would go with the NX setup myself. Cheaper in the long run. And a bottle blanket. For some reason, NX's bottle blanket is like $100 more than NOS's. But it does look way cooler, lol.
Most people shy away from Nitrous, but I freaking love the stuff!!