I haven't seen most of them, but voted for Falling Down, which I saw the first time 2-3 weeks ago. I was pleasantly surprised with it, and a little bit of that can be put down to the way it reminded me of Do the Right Thing (simply by being set in suburbia and on a visibily hot day). The premise also seemed to remind me of another movie but I could never put my finger on. And no, not Taxi Driver.