If the rotors are still true (not warped), have them turned. Also keep in mind rotors aren't that expensive, I got my rear ZJ rotors for $25 each at Napa, alot of places wanted that much just to turn them!
If the calipers look good, hook em up and bleed them to get any gunk out of the system, and slap some need pads in. Loaded calipers are expensive, and usually come with low-mid grade pads. I went with the Napa Cermaix pads front and rear after much searching and praise about them. Expensive, but hopefully they're worth it, supposed to be low-dust which is good because I hate brake dust.
Good luck with your swap, mine's scheduled for the first week of September. I just need a ZJ proportioning valve, YJ brake lines, the Currie brake hose kit, some new axle flange studs, and some Amsoil 90W and I'll have everything I need.