Imo the aldor weap is too hard to get. It is worth to have a slow weapon to switch to for DPS though, since the increased dmg to Devastate.
Imo the instance drops are the easiest things to get (after perhaps Q's) and the exalted rep rewards the hardest. I'd suggest you gear up your tanking gear by doing the instances to get the closest to top knotch gear as possible. That includes heroix. I'd actually run Heroic SH for the fist, just coz it's awesome for Devastate spamming (I know it's PPM, but hello hasteland).
Also note that items with sockets have a really great ability to become better than items with higher item lvl, but no sockets. In heroics you'll get epic gem drops, and some of them are rather sexy!
It would be very hard to find a relevant quest item for each slot. But if you've got suggestions to things that should be on my list then feel free to add them!
What I did when I made this list was to browse WoWHead and apply a filter. After that my common sense and Utar's idiotic halucinations determined which rank the item got. We were most of the time agreeing on what got 1st, 2nd and 3rd however, so I didn't have to let him down too many times ;D