It all depends on what you want in a "chip." If you like tinkering with the PCM and fine-tuning, get a tuner; I was impressed with the Predator for its user interface, and I looked at the Tweecer RT a while ago, and it can do almost anything but looks like it has a steep learning curve. I haven't read much about the XCalibrator (sp?), but I'm sure someone will chime in. Tuners are also nice if you want to continue to modify your car; you won't have to get the chip re-flashed evry time you change/add something. If you don't plan on modding, or don't like to mess with things, then get a chip.