I am the odd ball, I only solo, I only like using Heavy Weapons and I use Healing charms on Barb/Guardian (for the Heavy Weapon setups and EES gear I have), Samurai
I solo, so I use Salvation + Retribution ... since I only use +Stat armor, and at higher levels, you will take damage, and at higher levels it takes longer to kill monsters ... Salvation to Heal ONCE and continue Attack (if you have the right EE heal type charm and base 30 Int) ... also, the reverse happens, you keep healing yourself while charging up Retribution so you can kill off that EP or annoying last monster. The 3rd reason I do this... Proficiency gain using Healing has a 78% change to gain +1 prof point vs Melee attacks being 18-20% chance (based out of 100 monsters killed).
30 Base Intelligence ... 125% EE heal type charm(s) @ levels 25, 35, 45 and 55
100 Base Vitality ... giving you more defense, +4 total Life Regen (base) and Physical Defense
XXX Strength ... REST, if using Clubs, Swords, Axe or Batle-axe which have higher Strength Ratio to these weapon types.
+Stat (str) Armors (25, 35, 45 & 55) you can opt for a level 45/55 armor with 40 or more intelligence (plate or chain pref) ... cheap armor. to help with healing capacity.
You need to practice and test for your play style.
Note: people have not mentioned this ... Retribution / Power Strike / Power Cast are extremely powerful in damage, now the damage diminishes based on the amount of monsters it attacks.... Two Hit Back is half damage (example: damage split by two because of two monsters). So, Multi strike damage is also weakened by amount of monsters attacked, same for Knockdown (3 max) or Retribution (6 max). Not sure if it is coded specifically for divided damage based on maximum of the Ability, or by the amount of monsters appearing on screen.