I've finished updating my spreadsheet to take into account all the recent gains I've made gear-wise and I've also updated the sheet to take into account all encounters in heroic instances. Since our Gold Team had last week off after our first run into Naxx, I'm hoping we'll be up to the challenge again this week.
Two weeks ago we cleared the Arachnid and Plague Quarter before we attempted the Construct Quarter and ran into healing issues on Patchwerk. Hopefully we make it that far again this week and perhaps we can run into the Military Quarter to give some bosses a poke in there.
My upgrades in order of priority (sorted into 4 categories - highest, high, medium, low):
The Turning Tide (1H weapon) - Kel'Thuzad
Life and Death (1H weapon) - Gothik
Signet of Manifested Pain (Ring) - Kel'Thuzad
Gothik's Cowl (Head) - Gothik
So as you can see, I'd love to do the military quarter just to hit up Gothik as he has my best in slot helm, and the 2nd best weapon before reaching the end of heroic Naxxramas (where my best in slot ring and weapon drop).
Surplus Limb (Offhand) - Patchwerk
Valorous Frostfire Shoulderpads (Shoulders) - Loatheb
Cincture of Polarity (Waist) - Thaddius
Binding of the Expansive Mind (Wrist) - Razuvious
Again, best in slot from Razuvious in the Military Quarter while Thaddius and Patchwerk in the Construct Quarter offer me best in slot offhand and belt. And then there's Loatheb, who we can easily kill on a weekly basis if we get a group together who has my best in slot shoulders.
Gemmed Wand of the Nerubians (Wand) - Anub'Rekhan
Boots of Impetuous Ideals (Feet) - Loatheb
Gloves of Grandeur (Hands) - Sapphiron
Cosmic Lights (Neck) - Sapphiron
Here we see Anub'Rekhan and Loatheb - both easily killable for our 25 man group dropping best in slot wands and boots, respectively. And then there's the big, bad Sapphiron, who oddly enough drops only slight upgrades, though the Neckpiece and Hands are best in slot.
Note: when saying best in slot, that ignores Sartharion (no drakes) and Malygos on heroic modes. I might go into those later. This is for all content up and through Heroic Naxxramas.