I am building (well, started a year and a half ago, and am finally picking it back up) a 6 string fretless with a Black Korina body, a Myrtle top, a Purple Heart neck with an Ebony board. I am using a set of Aero single coils and what I can't decide is whether to get a pre-amp or just make it passive. I am looking for a nice round tone, that is lively without being too trebly, but also not boomy, and of course, the Jazz growl. What do you guys and gals think??