Questions about mods need help and info

I have a 08 2500 with the 6.7 that is completely stock I am thinking about ordering a kit witch includes s&b cai, 5 inch flo-pro tb straight pipe exhaust witch delete the dpf crap, a full egr and cooler delete, and a h&s tunner, intake elbow and possiably a grid heater delete. I was wondering if this is a good way to go and also wanted to know if it would be a good idea to upgrade the injectors if so what size and brand are the best. I do moderate pulling and hoping to maybe one day be around the 700hp mark don't know yet. And if there is any other mods I can do plz let me know!!! Any and all info will be greatly Appreciated thanks....