I'm using GK MB200 for most of my gigs.
It's great with upright & slab, weighs nothing & is cheap as chips to buy.
There's an aux in if you base a preamp for upright, the Eminence works well without a preamp, simples!
There's a second hand one on here for under £200, they're only about £210 new!
For louder gigs I use the GK MB210 combo, again it works well with both upright and fender.
I've had Markbass, Doubler & Acoustic Image & Genz Benz & Phil Jones, still prefer the little GK