Decent strength, but not exceptional.
And for me, if you go strength, you want speed to go with it .... and tornado, implacable, impact + sabotage and ideally pugnacious become MUCH more important.
You need good defence as well as you will take more hits. Decent HP (the bigger the better!), potion, survival, armour + skin + shield are essential.
And if you can get untouchable in there as well ... even better!
Diddy was my original preferred model.
He has been surpassed now by: http://bobthebear022.elbruto.es/cellule
And if you want to go down the Str/AGI route, they don't come much better than: http://koerper4812.mybrute.com/cellule