you're behind in that build, as you've already passed the first set of automatic level gains without getting a stat to the 4th or 5th cap(73 or 77). So I would get strength to a natural 77 and then get agility to 80(i'm assuming you want to be a DT and not a NT)
As for your equipment I would put it all in strength. Dont put any more points into SA's untill you have your attributes where you want them to be finished at.