A couple of thoughts from my experiences:
1. If you rebuild the rear calipers this video from Eric at PMB is an awesome resource:
Caliper Rebuild. He's also a great source for brake parts.
2.
I agree about replacing the flex lines.
3. If you buy the Textar brand brake pads they don't fit without some modification. Pelican notes that in their catalog, but I didn't see it, and nothing annoys me so much as buying a new part that doesn't fit well. Pelican did graciously accept a return and credited me toward the brand that fit without any modification
4. Rebuilding the front calipers can be a little more challenging just because it can be difficult to get the pistons out. There are different suggested methods. I tried to use compressed air method, and while I didn't hurt myself or anyone else in the process I did ruin the caliper and ended up buying rebuilt front calipers from someone else. Cautionary tale, and I can explain more if you'd like. There are other methods to accomplish this, apparently.
5. I like my power bleeder. I can bleed my brakes quickly without dragging a "volunteer" from my family out into garage to stomp the brakes.