Who to hard main?

I am a bronze player and I am looking for a champ to hard main. My preferred role is top and the champs I own are: Akali, Ashe, Blitz, Darius, Mundo, Fiddle, Fizz, Garen, Hec, Jax, kat, kog, kha, yi, nasus, malph, ori quinn, nasus, renek, rumble, shyv, singed, sion, teemo, trynd, tf, twitch, udyr, veigar, viktor, ww, voli, zac, xerath and zed.

I am 5 mastery at blitz darius zac and renek.

I like tanky champs who can get in there but also champs who do good dmg. I have basic rune pages for ap and ad, although i do not have cdr blues or as quints/yellows.

I prefer mid-late game champs but early is not a problem.