Dont buy a zex kit, worst garbage out there. Pick up a cheap kit and a bottle heater.
Id personally just use a single wet nozzle, and you dont need all that saftey garbage. An arming switch, and WOT switch are all you need. You have a manual transmission, so no need for a window switch when you get off the pedal anyways to change gear, fuel pressure saftey is useless too because its going to be too late by the time the thing reacts.
Check out all the basic kits from these companies, they are all reputable and I have run or am running parts from all of them.
www.harrisspeedworks.com
www.nitrousoutlet.com
www.dynotunenitrous.com
My current setup is a dynotunenitrous.com dry kit, harris speed works 90mm plate, and a nifty little device that lets me spray a dry shot after the MAF. I have an arming switch, WOT microswitch mounted on my gas pedal, and a trans brake switch mounted on my steering wheel to activate the kit. Spraying the sum'bitch out of the hole, right through the shifts, and out the back door at around 120mph.