For the price of the Rumble 100 you can find a larger used combo with a DI that will carry a band or at least serve as a stage monitor and go to the PA. I downsized from a stadium rig to a simple Hartke KB12 and that's all I need. Check those out or other combos with a DI.
Or if you don't mind the weight, you can find an older red stripe Peavey TNT or Combo (that's the actual name) that will still be going when you die of old age and is loud enough to kill small animals.
Once you get your 'stage legs' under you, THEN you can go spend $2000 to $3000 on the latest handcrafted whiz-bang head and cab that will surely be suggested any minute now.