Input on which chip/programmer to choose?
The search feature is your friend, as is research. This is a vast subject, with countless differing opinions, all posted within the archives of threads here and on most other Powerstroke sites, and most all tuners have their own sites, as well.....
I see only "Zoodad" In your sig, and no mention of gauges.
Get them first. Pyrometer(EGT), Boost, and trannytemp gauge at least, then or while youre at it, upgrade the stock intake to at least the DIY Tymar/BHAF/6637 air filter, and either do a muffler delete, or get a nice aftermarket exhaust.
In simple terms, set your truck up to speak and breathe, then think about chips/programmers.
"Blizzard" The big white bio-burning 03 7.3. 6637, straight piped stock exhaust, and a "New" secret blend of Haul asBLEEPsing mods and upgrades. Suffice to say, its not the fastest, but it quite possibly is one of the quickest.