We've got some active threads around here about air dams that you may be interested in reading. Check out Big Dave's F350 as listed in the 65 mods section, and kach22i's recent thread (S-10 pickup) for more info on that.
I've got a Canyon that I'm probably going to mod with an air dam this summer.
If you don't plan on carrying large or awkwardly sized cargo that would stick up over the bed, you may want to consider a tonneau cover of some sort. Even if you'll be carrying large cargo some of the time, some covers are pretty simple to remove.
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