If you want it to look impressive, then the Ampeg Micro VR or CL would be great (the mini stacks, the VR is the 200w version, the CL is the 100w version).
One of the Fender Rumble amps could be a good investment?
Maybe an Ashdown would be a good choice? CTM30?
Maybe even the Hotone Thunder Bass micro head (5w) and a cab?