I'd go with OEM rotors and EBC pads, either Greenstuff 6000 or Yellowstuff depending on how much weight. The Yellows are way more aggressive than the Greens are are more of towing and heavy braking, you'd probably be OK with the Greens since a bumper and sliders at most add 300lbs.
I've ran EBC pads on my rally car since it was built and they've been great.
Avoid anything slotted or drilled for rotors if you're planing on upgrading those. They have an increased likelihood of cracking when they get wet and assuming you'll be offroading, that's not something you'd want to do.