Hello everyone. I am looking for your expert opinions here. I have a fender rumble that I play through when I jam with a guitarist. We just added a drummer and are looking for a singer, so I need to get louder. I am looking at combo amps vs head/cab. I am leaning toward a used head and cab, but not sure which one to get first and match to the other. Just wondering if there is a method that works better. Head or Cab first. Thanks 