im still on ItemPreview, for me its just the most handy version of looking deeper into items ingame that are not already available. And IP is a small download on its own, but after the first start it will take a few minutes to build up its database.
CharPlan is nice if you want a RoMArmory replacement as an ingame addon, though its not yet perfect with all the calculations.
DungeonLoots is like IP with links to the actual location of the drop (but afaik you cant look just randomly for any item in the DB? dunno) but i dont need it for myself. Props to the creator because he's on my server, though
And i've heard there's again a website-version for things like CharPlan on the way and not too far from being finished (so yes maybe there will be soon a web-based Armory replacement, but i dont know any ETA atm).
All 3 are usable though, but depend on what you need.