Going crazy with first SBR build questions-10.5/11.5/12.5?

[Sarah]

I have been reading and researching on my own for weeks and would like some opinions to help me out. I'm torn between the PWS 12.5, 10.5, BCM 11.5 or Noveske 10.5 or 12.5 with switchblock

This will be my first SBR and here is what I'm looking for:

-Lightweight (I'm 100 lbs with tiny arms so ounces do add up for me)
-Suppressed 95% of the time (eventually down the road, but not initially)
-going to be a SHTF, desert training class,HD gun
-while not intending to ever use crappy ammo, I want it be able to eat what I feed it and don't want it too finicky.....

Thanks!!