Go the supercharger, you'll love it.
And yeah you can change boost by smaller pulley & the tune, e.g my car can be adjusted from low boost (3psi ish to 9psi ish stock standard) but if I want more than that I need to buy a smaller pulley to spin the supercharger harder. The problem here lies that then generally need the supporting mods like a turbo car, fuel pump, injectors etc.