Shia over at Genesis found this on the MMO site and it is superb. It is updated every 12 hours and are limited only by the accuracy of the Blizzard servers (no jokes!).
http://armory.mmo-champion.com/heroics_out/aszune-silver-oak-guardians-70.html
The heroic attunement summary is a sortable list and you can also find other comparisons and links here (http://armory.mmo-champion.com/).
TL.