I confess, i'm starting to have a hard time deciding which parts to take and which to leave behind, selections getting pretty good. It looks like the shield chips don't seem to be working though, the ones that give +1 to adjacent items. Also, really wanna try the energy drain and, uh, fusion drill? Sadly, only places i've seen them drop so far is from the last boss. T_T
edit: Actually, I just got hold of the energy drain weapon, seems to need some tweaking. Shooting it before the enemies first fire doesn't seem to have an effect, and shooting it when enemies are charging in some cases doesn't stop them firing as if they hadn't lost energy.