I would vote for a fretless Westone Thunder 1A. Unlined board, gorgeous tone. I replaced my Squier VM fretless with this as I think it is a better made, better sounding bass that goes for much the same, or less, money secondhand. Status black nylon flats, yum yum.
Not me, but gives a good demo of the sound.
http://youtu.be/WrzEzczWgCo