I believe that, frankly, Soriatas armor (which is light power armor, although not the void capable stuff) would fit those requirements, aka, not slowing Sarah down while providing the best possible Armor, is probably around the best we could do for her.  It would give her 7 armor and a +10 Strength and not encumber her, unless of course the power was off...  But given Sarah's general role in combat... aka, pilot, not bodyguard, rearguard not frontguard... She won't need armor for long periods anyway.<br/><br/>Of course, we could just get her some nice mesh... 3 armor and 15 kilos, I believe, which is about the best she could do otherwise if she's concerned about encumbrance but still wants armor most everywhere.  I believe either option is about the same difficulty to get, but I'd have to check.