I also use spreadsheets, but I'd love to find an addon that can do the following;
- let me preview, store and quickly load items onto itemslots. Kinda like the preview of MogIt.
- Let me see each items stats on Mouseover, and like as if it was a character page - the summary of all crit, mastery, haste etc.
- Have the possibility to store items to itemslots, so that when I click on waist, I can see the other options I've stored there.
- More unspecific functionality.