+1 to trying out as many basses as possible...
Remember the same builder can make basses with completely different tone, so on the Alembic front, there may actually be one in a shop which is suited for you tone wise. So try ALL the "boutique" basses even if you have turned away from a certain luthier.
If you were getting a new bass its completely different because you can get stuff which compliments the tone your want to achieve. Anyways good luck on your search!! And have fun in the process!
Praise and Worship #1136, "Mmmmm Claro Walnut Burl"