I've experimented a littlebit, the most important thing to have is a nice energy and health pool.
You could invest all points in strenght, but you wouldn't be able to cast a spell or last 5 seconds against a boss.
You will have to find out what skills you are using and how often.
My energy is at 139 without necklace at the moment. Im using a Greater Charstone Ring for armor so...
My health is at 469, which is not good or bad. But I keep my stats equal for simplicity.
These are my Stats:
- Strength: 75
- Dexterity: 75
- Focus: 50
- Vitality: 75
I've tried to invest nothing into str, which was no real problem as I used skills to kill enemies fast. But when you're playing with a group against bosses and you gain no energy in a fight, you're damage will just be too low. Nothing in vitality is a pain in the ass because you can't handle any pressure at all. Energy is awesome to keep up buffs and deal extra damage. While without dex you wouldn't really hit very often and get hit all the time.
Hope this helps