Compact mirrorless cameras are the big third category you're missing, I think. They're the perfect mix of quality, portability, and discreetness, which makes them excellent for travel and street photography. The Fuji X series are great examples. I wouldn't dream of taking my Canon 6D backpacking, but my X100T goes with me everywhere and produces excellent shots. My Instagram handle is @paulwithap if you want to see some examples (I rarely post there anymore, so this is definitely not a shameless plug ;)