If you want to keep it really simple up to 125hp both BBR and JMS have nice simple dry kit set ups with tunes. If wet, go with a plate kit, once again BBR has a nice NX plate kit with a tune. You MUST have tune for these cars to spray. Ive been running nitrous for years on a lot of different cars and this is the first one Ive had that you cannot tune the spray via pulling timing and the fuel jets, you must have a custom tune for several reasons. I tune mine with HP tuners myself, but have seen the BBR tune and it's done correctly.
IMO for a simple 125 kit daily driver:
1. your brand of choice dry single fogger - screw that trying to hide it in the sound tube bs - use a fixed mounted single dry fogger in your cai tube or stock intake tube
2. window switch - make sure to set nitrous cut off below your pcm hard rev limiter
3. bottle heater - the brackets with the built in heaters are much nicer than the blankets - most of them also have automatic pressure controlled on/off cycles
4. TUNE - tough to beat BBR-Chris Jones on these nitrous tunes
5. You could probably get away with stcok plugs up to 125 hp, just datalog and see whats going on when you spray.