This thread isn't really maintained too much anymore.
Generally, you never see forum stickies with advanced gearing info because by the time that you're ready to start replacing epics with BETTER epics, you should generally know:
1) How to use AtlasLoot, Alla, Wowhead, Warcrafter, etc, etc..
2) Exactly where your character needs improvement.
3) What each stat will actually do for you.
Meaning... it shouldn't be needed.
If you're interested in some of this information however, check out:
http://www.failsafedesign.com/maintankadin/viewtopic.php?t=2652
As well as the other threads in the Gear section there.