I like the idea of playing the rested xp in priority of how much I enjoy a team. I'll probably play my favorite team's rest up then move to a 2nd and play it. If the second runs out and the first still doesn't have enough rest, I'll move to the third and so on.

The single dragon elites in the beginning area of the nexus is also a good idea. I remember they are immune to most special abilities like most bosses are but I don't remember how hard they hit. Do you think a 5x DPS group could down them before being killed themselves? If so could they do it at level 68? If theres a tank in the group could it be done at 68? I think there are 4 of them around the perimeter and 1 in the center near the final boss. All 5 of them could be killed for 20k xp and then reset.