Return of Reckoning

Hello.I have some questions.I cant decide which set is better.I know sove/warlord mix is bis but i dont have time and patiance for this mix.

1.Its hard to cap str with dok dps i guess.How much str is enough?
2.I cant decide between 3 pcs blood lord or 3 pcs oppessor.
3.Which stat is most important ...