It pretty much depends of what you want to do. For PVP i'd say prismatic with reinforced and heavy duty boosters, maybe one or two resistances. For PVE i would suggest bi-weave, since they have better regen rate and you actually don't need big shield capacity vs NPCs, but it also depends on ship you are using. For resistances, 50% is soft cap i think, maybe i'm wrong, you can correct me, but i'd say stacking resists after 50% is pointless.