I love my stage 1. To avoid the the " who is best " I will just say what I have experienced with mine. I got stage 1. The tuner asked if I wanted egr delete or regular. I am not a crazy diesel hot rod person, I as you wanted the speed limiter gone and I also wanted a tad more umph!
I am completely happy with my tune. Still got mid 30's in mileage all day long in Colorado mountains, mostly in low range.
In another thread, a person got the stage 1 and later did the egr delete and had issues. He contacted the tuner and the did a fix for him. I don't know if they charged him or not. He is suppose to install it this weekend. So it sounds like you need to get a tune for EXACTLY WHAT YOUR MODS ARE.
BDRAG