If you end up going the Alembic route, I would recommend an Essence over an Epic. The standard Essence model has the low pass filter which is at the heart of the Alembic electronics package. Standard Epics have bass and treble eqs only. Also, I prefer the look of the Essence. My first Alembic was a 5 string Essence and it was a great bass.
Best of Luck in your search.
Lover of Alembics, Seahawk Fan, 5 String Club #73