I would stay away from the ABS cement, it can cause warping. I prefer CA glue which can typically only be purchased at your small local hobby stores looks like this Maxi-Cure. It has a very fast cure time and you can buy an accelerant to spray on for an instant cure. It is very strong and won't warp.
I have E6000 in my tool box also, but I prefer the max-cure CA glue for putting the armor together. I have had E6000 pop apart, but never CA Glue.