My 5 cents is that if you truly loved your Alembic(s) at purchase, you will regret selling it, even if just for sentimental reasons. For practical purposes, that may be unavoidable, until such time that technology will allow for a signature or anniversay bass to be converted to Series status. I have been fortunate (and lucky) and not had to sell one Alembic to buy another, but ultimately, if you really need to upgrade, then you must do what you must. Good luck whichever direction you decide to take.