Well you have two possibilities, I tried both of them.
You can go pure strength if you are using daggers, this way your damages will be a lot higher than if you had dexterity. However you will not be able to do a lot of criticals, that's why you need dexterity.
So
- if you are using daggers i would aim for about 90-100 dexterity and all the rest into strength.
- if you are using swords i would aim for about 120 dexterity and all the rest into strength.
of course, all depends on your gear, if you have dexterity gear, wear it and add all your stat points into strength, and vice-versa if you are using strength gear.
You can pm me if you have any questions.