Obviously Johnny Bratton. From the current crop of boxers, Carlos Cuadras has shades of sugar about him.
I always felt like Floyd Patterson in his early fights and as an amateur fought in a similar style to Robinson. Also: Leonard, Bratton, Napoles, Ali, LaRocca, McCallum, Hearns, Mosley and the Cubans, Adolfo Horta and Ariel Hernandez.
Johnny Bratton definitely the budget SRR. I've seen Hearns circle around the jab with his rare foot off the canvas the way Robinson would do at times.
As many others have said Johnny Bratton had a style very similar to SRR. Others worth mentioning: Jose Napoles Ike Williams Joe Brown Lionel Rose