I decided to take someone else's lead and threw light at it myself...
My grid is also here if anyone wants to see it:
https://i.imgur.com/OYUNOTx.jpg
I doubt you'll need soul points as they haven't tossed new souls on the DMM side for who knows how long (it's dead like the storyline)....
So, that's more for newer players to catch up really... i'd honestly get the SSR gun before the Soul points cause I don't need soul points while there might be a chance to use the gun later on if they start FLB-ing the advent weapons.... in order of priority, everything else is worth more than the soul points if you don't need any soul points
sure that gun is stuck being HP and DA for a while (if not forever) but it honestly would get used sooner than the soul points and that's saying something...