rotors
Sorry - I did not mean this to be a personal attack - (although it did come off that way). What I wanted you to realize is that other 3500 owners with 2WD have an even more expensive brake repair in that some years have integral hub and rotor design which ends up being 3X's the cost of replacing rotors on 4X4's.
I have had excellent results using Performance Friction pads (the cheap $36 /set from Autozone with a lifetime warranty) on the original rotors (which also heat checked and heat cracked) and then also good results using Napa aftermarket calipers and rotors.
With the Hawks, you should see a similar improvement.
Regarding slotted or drilled rotors, this will only be an improvement over stock if you are having problems with heat fading due to excessive loading. The slots or drilled holes allow the built up gas from the pads someehere to escape. However, those slots or holes also take away surface contact pad area and in some cases, although they look great, can result in reduced braking force due to reduced surface area.
Now if you increase the size of the rotors / calipers / pad area, that is something totally different.
Since you were asking for 'cheap', going slotted or drilled with different calipers is NOT going to be your least expensive option.
Cheers,