It's hard to pick!
Top solo: Rene, J4, Rumble, Nasus, Singed, Yorick (my fav probably)
Mid: Talon(when he's a counter), Brand, Swain, Ryze, Malz, Karth, Kassadin. My two new favorites are Gragas and Cass, very strong heroes and so fun to play!
Jungle: WW, Trundle, Lee Sin, Gangplank, Rammus, and Amumu
AD Carry: Ashe, Cait, Vayne, Corki, Trist, Sivir
Support: Janna, Soraka, Blitz, Leona, Karma, Sona
I think for most heroes I've got at least 20 games played, many much higher than that. I've stayed away from AP carries, but am making it a priority to get back into that groove. It seems to be much easier to carry from AP standpoint to me.