Stiffer IS better! (insert corny response here). But, lowering it would drop the center of gravity, thereby reducing body roll which would make it more stable when turning.
But, don't listen to me, I'm just playing the devils advocate simply because I've lowered almost every car I've owned (including a '75 Dodge Dart Swinger).
Can you get Konis or Tokicos for your car? How about stiffer springs? You've got feaf springs on the back right?