Enchantrix

Description
Enchantrix is an addon that provides your tooltips with additional information on the elements and quantities that a particular item will disenchant into. This plugin is primarily for enchanters to see whether they should buy an item based upon what it will disenchant to.

Now it also attempts to show estimated value of disenchants as well. If you have auctioneer, it will tie in even closer by using the bid data from auctioneer.

You can do /enchantrix percentless and /enchantrix bidbroker (which are like the auctioneer counterparts but work on the disenchant value rather than the resale value) [needs auctioneer for this function too]

NOTE: This addon is stand-alone. It does not need Auctioneer, ItemsMatrix, LootLink, AuctionMatrix or any other mod. Using it by itself is completely acceptable.
If you do have Auctioneer, a few more features become available, but this is not necessary.