Rebuild help.. DD S60

Hello group! I have an '05 Columbia with a Series 60 with over 1 million miles.. The motor is still doing pretty good. Horsepower (is at 78%) and mileage is down, but no other big issues (blow by, oil consumption, etc..) except for EGR leaks and a Delta Pressure sensor that keeps plugging up and going out of calibration.. But now, my EGR cooler has decided to develop a hole in it. The shop wants $1800 for that, so I figured why not just take it to Detroit for a rebuild since it is over a million miles.. So my question really should be.. Which rebuild to do? I'm thinking a Step 2 with added injectors, (my current injectors are 4 years old this month, and my turbo just turned 2). I would do a full Step 3 but that's just a bit beyond my current finances..

 

Just because new injectors were recommended by my local Detroit and Freightliner dealer..

 

I would not only love to delete the egr, but any and all sensors and other such nosense.. I never plan on going back to Cali again..

 

My local Detroit Dealer says that they can't bench test injectors, so I would really be taking advice from a shop that sells them.. I only go thru 1 gallon of oil between oil changes, and when I need that gallon, I just get a p/m..

I would love to dump the EGR if I knew of a shop locally that could do the work.. I live near Springfield, MO..