if you are under 40, buy an old heavy rig for cheap.
otherwise, go small and light.
Brands don't matter much.
Smallest is an Elf 200w head into their 10" cab that weighs 8kg. Add a second cab. Small, light, LOUD. has a seriously good DI out as well.
Markbass Vintage 500w head is killer, has a working tube in the preamp.Gets that old school tube warmth.
GK, Ampeg, make heads at many price levels as do Peavey and Hartke. All are good working amps.