Make sure you check w/Kenne Bell. IMHO they ARE the leaders in Ford performance. You don't want to run a chip 24/7, they tend to carbon-up an engine because they boost fuel injection and they advance the timing. Besides you MUST run premium. Kenne Bell has a "Switch Chip" that allows you to run a stock/performance, a stock/racing (illegal for the street), a racing/performance, whatever. And it comes with a switch (hence the name) that will let you go from one program to another. I have a stock/towing program for my V-10 Triton and I love it. And they're usually a couple bucks less than SuperChips or Diablo chips.
www.kennebell.net and click on the 'e-mail us' icon. Ken Christley there is the man, tell him I sent you from the Ford truck enthusiasts board. You'll be glad you did, Ken 99 SE Contour Zetec ATX, 98 E-350 XLT ClubWagon V-10
