Thanks to all for your comments. They helped reiterate some of my own opinions about my pieces. So, each school will get a slightly different portfolio (depending on if they focus on electronics, requested only 3 pieces, etc.). They will receive some combination of:
Five Pieces for Laptop Quartet
Five Movements on Mondrian
Looking over requirements once more, I see I had forgotten that UCSD and U of Chicago request two writing samples. Looks like I will be revising either the Schoenberg paper or Sonic Generator paper. You can read those on my site if you are having trouble falling asleep or something.