What do you want to do with the car?
I, personally, wouldn't go with Nitrous injection at all. With some excellent porting work and fine tuning you can reach 200+ whp with the 13B.
If you really want to build a car that is all NA that will kick some ***, source a 20B(3 rotor), and port the **** out of it. Run ITBs and an EMS and you're golden.