Switching off is always a crowd pleaser. My brothers can both sing/play drums and they'll switch off from time to time in their band (mid-song yeah!).
I have zero bass experience, but if I was going to buy one, and I've been tempted from time to time, I'd buy a Chapman MLB-1. You get the combination of having something almost no one else has combined with the quality stuff those little old Korean ladies are making. I don't know if you want to spend $750 for the novelty, though. There are probably really good, cheaper options that the bass players here could offer up.
I have one of their guitars (ML-2) and it is fantastic. I'm a rank beginner guitar player and don't have many guitars to compare it to (2013 Gibson SGJ, made in America, and an Ibanez S520, made in Malaysia I think) but it is as good or better than either of them, especially the fretwork. You run your hand up the side of the neck and you wouldn't even know there were frets there if you weren't looking at them.