I don't think I can get to ten honestly, so here's top 6-7 IMO. I base it mainly of accomplishments, but potential can be used also.
1. Mayweather- obvious
2. Ward - basically cleaned out the division
3. Rigondeaux- boring as hell unless you bring the fight to him, and I don't see anyone beating him. Supposedly one of the top amateurs of all time
4. Danny Garcia - Has beat everyone in front of him convincingly. Not many left at 140 lb to face him
5. Marquez
Bradley
Pacman
I'd give the slight edge to Marquez out of the 3 because of his devastating knockout over Pacman, but he did lose a close fight to Bradley and lost(although debate able) to Pacman the other times.
Klitschko would be next
Erislandy Lara would be close also. Can box and has power.
Sergio Martinez is on his way out.
May
Klitschko
Ward
Bradley
Rigo 
Floyd Mayweather
Andre Ward
Sergio Martinez
Tim Bradley
Juan Manuel Marquez
Manny Pacquiao
Guillermo Rigondeaux
Carl Froch
Danny Garcia
Roman Gonzalez
The top 3 are light years above everyone else, but the top three are:
MoneyMay
Andre Ward
Guillermo Rigandeux
The rest in no particular order:
Mikey Garcia
Danny Garcia
Sergei Kovalev
Wladimir Klitchko
Timothy Bradley
E. Lara
Mayweather
Ward
Pac
GGG
I think Kovalev and Carl Frampton are future contenders
Didn't mean to leave Rigo out.
He is the business
PoundforPound - Floyd Mayweather
Andre Ward
Sergio Martinez
Tim Bradley
Juan Manuel Marquez
Manny Pacquiao
Guillermo Rigondeaux
Carl Froch
Danny Garcia
Roman Gonzalez
i strongly agree with this list