[brianeyci]

I think phased shields IV generate 300 in stock, phased shields IV generate 375. The jump is big, but I think its only really worth it to start mounting phased shields when you have at least phased shields III. Any less than that, and if your opponent has PPB's, you should be able to outclass his ships anyway because you have hopefully been getting ECM and Combat Sensors while he's been wasting away his research on PPB's.

Brian