Best option for 4.2 F-150

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I have been wanting to get a gryphon programmer for a while now and it seems I have come across enough cash to full fill my dream.

But I have questions.

I know not to expect major increases but my truck is really bad on gas, I get about 14 mpg no joke but I have upgraded to 265/70/17 from the 235/70/17 and yes I have figured for the loss in mileage with the larger tires.

Question #1 Should I do a few mods before I get the programmer?

The only mod I know I will be doing for sure is an electric fan because it's the cheapest. Do you guys have any good recommendations besides that.
I'm not to concerned about mpg but I would like to pick up some hp without losing any and maybe gaining a few.

Should I go with the gryphon or one of the other 2 programmers php sells?

Thank you