Well you need to take the fight in two stages, one is dealing with meph and the other is baal and diablo. The main change would be swapping out the helm from kiras when fighting meph to g face after your done
helm: kiras or g-face
body armor: coh
shield: spirit ward (fade and resis and block)
belt: Dungos (life and additional pdr added to fade)
rings: rings with resis +stats (may want fcr rings if you are doing the lesser minions and using enigma)
wand with tap charges
charms - stack resis is important, so is fhr, +damage is a plus because you will be jabbing or fiending.
Skills - i am unsure of (note that d/a/e might cause you to go into a lot of recovery because of all that is hitting you. Think twice before you put too much in those skills. A valk with maxed decoy can take a lot of hits so that might be good.)
-I have never tried ubers or prolly will ever, but i would appreciate if you let me kno how you do if you choose to try it.