School me on '03 Dodge Diesel Programmers

What's the best bang for the buck, and what needs upgraded?

1st choice Smarty. 2nd Choice TST. Smarty is a downloader and no mods are required at lower HP settings. Make sure your factory lift pump is up to the task tho. If looking for more than 100 extra HP, I would upgrade the factory lift pump to an Air Dog or a Fass. HP at or above this level will usually also require a clutch or a torque converter upgrade. A pyrometer isnt a bad idea either as things can get a little toasty when driven hard. The TST is an add-on box that plugs into the cam and crank sensors, MAP sensor and injector harness. It can be adjusted with a hand held remote on the fly. I would stay away from the boxes that plug into the fuel rail pressure sensor and raise the fuel rail pressure. They can cause injector issues with the excess pressure they create in the fuel system.

not sure if efilive is available for a 03 but have a look.

What about a Smarty Jr? Just recently heard about those...

Smarty jr has less settings and max hp than original smarty. otherwise its the same.