Wayne 1st and Nelson 2nd. Decker is a close 3rd to Nelson but should get Flowers, a top CB.
I'd play any of those guys you list ahead of Ballard for your flex.
Roto 5x5 - 1 Yr - 23 active spots (14 hitters, any 9 pitchers) - 5 bench
C - M.Montero, Gattis; 1B - Pujols; 2B - Altuve; SS - A.Escobar; 3B - A.Ramirez; CI: Frazier; MI: Walker; OF: Holliday, Cruz, de Aza, Markakis, Span; UT: ; Joyce P - Cain, Miller, Ogando, Milone, Cashner, Tepesch, Romo, Betancourt; Bench - Tejada, Griffin, Cueto (DL), Greinke (DL), Stanton (DL).