If your looking to make your Barb an experience barb you should either max them out or get as least strength as possible. Strength is the thing most needed on any character. Yes strength does add damage to Barbs around 2 on maximum damage every stat point. Dexterity is both need for lances and swords. A lancer without negative requirements needs 80 dexterity and 110 strength.
Dexterity adds to attack rating.
This is the most needed most important thing a Barb needs. With the addition of life from your items and life from each level you still need this. With a level 70 Barb you should have OVER 700base life. No need for this. Each level, mana raises by around 2-3.