Well going on three Stats is a little risky its better to just do two, I wouldnt chose any. Str isnt as good as End, I'm going on a 25SPR and the Rest end build, that way I will hit many more criticals, doing more damage than with Str, and End to raise my SP so I can keep on casting my skills and doing more criticals.
Dex isnt really something you should put your Stat points either unless you don't want to get hit as often, but not hit as high to. I would rather do more damage and take a little more damage, then maybe not take that much damage but also not doing much damage.
The best of the two would eb 3:2:1 str:dex:spr build, but I would reconsider your stats.
Just my two cents
