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Two completely different paths there! You could probably get a nitrous system installed and tuned for under $2k. You are not going to be anywhere near that with a supercharger.
I can find Eforce's for about $6K shipped, maybe less. Compared to the above $2k for nitrous installed, immediate cost can't be a main factor.
I won't do spray again because I really enjoy having the power all the time. Every on-ramp is a joy to goose it until 75 and passing people without downshifting from 6th is always fun. I can only see spray for when you're going to the track and you have time to prep for it by filling the bottle etc.
It really all depends on what you want to do with the car. If you're going to be using it for the track then I'd go the nitrous route. IMO the nitrous car will run faster than the similar car equipped with the EForce.
If you want some extra power for the street then I'd go the EForce route. You'll have the power all the time with no needed prepping.
Where in FL? If you are around Tampa the guy who did mine is great. If your in north FL I would talk to motorhead47. I have never run NOS but I have friends that do and it is a pain in the azz to get three quarter mile runs and have to change or fill the bottle.. It gets very expensive if you use it much. And it is like crack if you like it. I have the E-Force and it's great. The power is always ready. If you are in Tampa or willing to make the trip you are welcome to drive my car. We also have a great runner down the road @ the tuning school.