You could also do:
Least Steem Powered Down
Least Time Powering Down
Most Steem Powered Down
Most Time Powering Down
Most Steem Transferred/Invested (ie, highest "unearned by authoring/curating" SP)
You could also do:
Least Steem Powered Down
Least Time Powering Down
Most Steem Powered Down
Most Time Powering Down
Most Steem Transferred/Invested (ie, highest "unearned by authoring/curating" SP)