I've used both the
Bass Cellar and
Nnick Lloyd's shop. Both do great work. In the past few years I've been going to Nnick because of his openness to my ideas about how I'd like my bass to sound and play (even if they're slightly unconventional), and because he's really great about scheduling things in such a way that out of town folks like myself can arrive early and leave *with* the bass the same day when such a thing is possible.
Either way, you can't go far wrong with either of these shops. All three guys (Andy, Chris, and Nnick) are good people, good luthiers, and sillier than a lungfull of nitrous oxide. What more could you ask?
EDIT: Kaden, just checked yer profile...say hi to Patrick O'Roark for me when you see him. We had some fun times on a trip to the UK a while back.