I'm not sure what world Watto is world class but it isn't this one.
I'm not including players who don't play often enough or are just average at international level.
Australia
ATG - None
World Class- Clarke, Harris, Johnson
Very Good International - Warner
Good International - Haddin, Smith
Bangladesh
ATG - None
World Class - None
Very Good International - Shakib Al Hasan
Good International - None
England
ATG - None
World Class - None at the moment
Very Good International - Anderson, Bell, Broad, Cook
Good International - Ballance, Root
India
ATG - None
World Class - Dhoni, Kohli
Very Good International - None
Good International - Pujarra, Rahane
New Zealand
ATG - None
World Class - None
Very Good International - Taylor
Good International - Boult, McCullum, Southee, Williamson
Pakistan
ATG - None
World Class - Ajmal
Very Good International - Younis, Irfan (when fit) *
Good International - U Akmal, Junaid, Irfan, Misbah,
*Amir will reach this stage in a few years and should be an ATG
South Africa
ATG - Steyn
World Class - Amla, de Villers, Philander
Very Good International - du Plessis
Good International - Morkel
Sri Lanka
ATG - None
World Class - Sangakarra
Very Good International - Herath, Matthews
Good International - Jayawardene
I have to confess to watching less Sri Lankan cricket than I ought and I know there is at least one player I have forgotten.
I also think Herath and Matthews would be very close to world class.
West Indies
ATG - None
World Class - Chanderpaul
Very Good International - None
Good International - Bravo, Gayle
Zimbabwe
ATG - None
World Class - None
Very Good International - None
Good International - Taylor