"The Hawk" only played his last career season in Atlanta, and wasn't quite the same high flyer he was during his days in Phoenix and LA. But he remained legendary, and even if the dunks weren't quite as spectacular during his Hawks days, he was still Connie Hawkins.
Sura was a very exciting dunker and put on a great show in the 2001 Slam Dunk Contest, tying for fifth, but he entertained the audience with several exciting dunks. He played hard and occasionally threw down a monster. The 6'5" shooting guard from Florida State only played 27 games for the Hawks.
Smith only played 33 games in a Hawks uniform, but did so in 1989-90, when he was still a pretty exciting dunker.
Rider was past his prime by the time he was with the Hawks, but his name bears mentioning.
Ham played long past his prime into the D-League, but was a high flyer in his prime. He was always good for a thunderous tomahawk dunk or two.
Theus was more of a high scorer than a high flyer, but had a nice rim rocker from time to time.
How can you not mention the 7'2" Dikembe Mutombo's awesome array of power stuffs?