Nitrous is very simple until you start getting into the much bigger shots. For a 150 shot or less, you can get away with the simple nitrous kit and accessory package.
I always prefer a plate kit over a nozzle because it is a more direct shot of nitrous and fuel, and it mounts much cleaner under the throttle body instead of having to drill a hole in your intake tubing to mount a nozzle.
As for the accessories, the X Series stage 2 accessory kit is what I run. It comes with your regulated bottle heater, bottle mounted nitrous gauge, purge kit, and safety blow down tube.
Only other item you would need is a set of colder plugs (Denso 3381) if you run between a 100-150 shot. A wideband air/fuel gauge is highly recommended, but not absolutely necessary. The recommended jets that come with the kit will put you in a safe AFR zone to prevent any damage. Having an air/fuel gauge and multiple extra jets to dial in the AFR is the best way to do it though.
