Some of my favorite combination punchers:
1. Prime Oscar threw beautiful combos. He would hammer with the jab and throw multi-punch combos when the opportunity presented itself.
2. Julio Ceasar Chavez threw the most accurate and heavy combos I've seen. He didn't have that lightning bolt power like tommy Hearns or that single explosion like Tyson, but he had that heavy handed punch that just broke you down.
3. Meldrick Taylor is the only guy I've seen who had faster hands than Roy (couldn't punch as hard though.
4. Floyd Mayweather was a great combo puncher fighting 140 pounds and lower. He switched to pot shots and movement with larger fighters, but blitzed Chico, Gatti, Hatton, NDou...etc., with combos.
5. Loma throws some great combos today. He does everything textbook in that ring.