I've had good results with an Ampeg SVT210AV in that kind of situation. It's a bit heavier at a whopping 26 pounds, but take eq well at lowish volume and sits in a mix well. I've used mine with a five string for low volume rehearsals with an acoustic guitar and unamplified vocals and really liked it there.
That's also a cabinet that fits the OP's budget.
That's also a cabinet that fits the OP's budget.