Nitrous Question new to the game

I've been asking a lot of questions and learning a lot. I recently picked up a 08 300 SRT8 in CA and brought it back to VA.
Current Mod list
RT axle upgrade
Stage 2 Ported Intake by Arrington
SLP Exhaust and Hi flow cats
Stage 2 Valve Body (just installed)
Motor is at 88k

Currently looking to run a custom cam, upgrade valve spring set, and wondering if 100-150 would be safe? along with good tune. Brent at DTP would be doing the tuning. Now Ive heard some run 175 on stock everything, some with upgraded trans. Goals are low 11s even Hi 10s.
Also best kit to run? looking at Nitrous outlet and Nitrous Express.