I plan on maybe some 08 heads and intake but not much untill I can find a good hemi for sale lol. I just can't see throwing money into a 4.7 when the hemi is a much better base to start off with. I may just settle with superchips. Altho hemifever is cheaper for the can tune. But only thing a programmer can do is adjust the timing and fuel mix and if you load the engine with say a trailor it'll cause pinging and the knock sensor will take over and you loose your tune. So I need something to adjust the tranny.
In my opinion your right on the verge of needing a custom tune. If you had heads or cam id say yea. And if you plan on heads or cam then go for it. But even with a bigger throttle body your not flowing much more air then before with the stock heads.