For me it's Floyd, Roy Jones Jr, Pacquiao, Loma, and Wilder, in no particular order. There are other brilliant and special boxers, but I feel like their styles are so unique, effective, and unreplicable. All of them are ATGs or future ATGs.
Because they've beaten a boogeyman like Ortiz and are about to fight a guy who schooled a HW that's considered to be an ATG right? Of course if Wilder loses to Fury my mind will be changed on this list.
Wilder definitely deserves mention. This is not based on skill. Naturally and athletically gifted as any CW or HW I have ever seen.
For me its, Mayweather, Pac, Hopkins, Roy and Loma. If I had to put them in order 1. Loma 2. Mayweather 3. Pac 4. Roy 5. Hopkins