I personally would say put 10 points into both strength and intelligence. It would be hard to argue against putting all twenty points into either intelligence or strength however. I personally feel that agility is more important but strength can help at lower levels. I would recommend throwing all 25 into strength. Strength is bar none the most important skill for a melee type in my opinion.
Dexterity is good for procs and agility helps in avoiding damage.
However agility and dexterity items are easy to come by where strength items are not.