I vote for the Predator as well. With the programmer, a cold air intake and a freer flowing exhaust I gained a 4+ MPG highway improvement.
I also saw a significant gain in HP and torque at lower RPM's which really helps the truck move out. If you are interested, click on my "Ram Mods" link below and go to page 2 for the before and after dyno sheets. The gains tend to affect your mileage at first as it's hard to keep your right foot off the floor.
Of course, your mileage may vary. No warranty expressed or implied. Driver does not carry cash. Writer not responsible for direct, indirect, incidental or consequential damages resulting from any defect, error or failure to perform.