What do you use the truck for? Do you ever tow? Or are you rodding around in it for funsies? It matters alot. Do you have an EGT gauge?
You can get a heck of alot of power gains with very little investment before you dump a bunch of money into injectors. If you don't have an EGT gauge, get one before anything else. Then, I personally would turn that pump up if you haven't, then buy an Old Smoky Fuel Pin or grind one, and get a 3200rpm governor spring. After that I would get a better turbo. Add the intercooler. Then If you think you want/need more power, you can look into injectors.
I agree with Daniel. You already have the edge over the intercooled trucks with the injectors that are in the truck.