Thanks for clarifying Tom, but the difference is minimal.
Given 50 damage after the speed damage calculation:
It will give you 77,9 damage after wpf, ps and strength (raw_damage +=strength/5.0) is taken into account with your build.
If you go for 5 PS and 144 WPF, you will get 77,62 damage.
For 100 damage, which is quite a lot I guess, it would be 153,8 (your build) and 152,24.
With 15 strength you gain 3 more health points and can use any 1 handed weapon.