My 2006 F250 FX4

[Riche]

New to the forum and have read a little, but would like to open a discussion on my truck and get some advice.
It is a 2006 F250 6.0 FX4 with about 125K.
I bought it wrecked and fixed it for a nice price. I know I want to put a monitor on it to watch for signs of egr failure which brought me to a crossroad. Do I want/need a tuner? Or just a monitor?
I have been reading enough to decide that I am interested in FICM reprogramming b/c I get 11mpg in town...
But I am not real sure if I want to hop it up more than that. It seems to have really good power compared to what I use to drive and until I decide if I want to do any mods I am not sure if I want a big H.P. tune.
At any rate if you wouldn't mind putting in your 2 cents on setups pro's and cons I would appreciate any advice.

Thanks,
Richard