I pick up nearly any rare, tho if weapons are noneth (and it's not a caster weap), i'm just throwing it out again without ID
some weapons like the "druid" clubs or scimitars, sabers I might also let on the ground, tho I usually pick them up anyway, just to see the trolling 450%ed selfrep cudgel lmao
I also pick up any magic ring/amulet from nightmare and above, since I 2 40% mf rings and a 50% mf amulet (I have already 2 fortious rings of chance, tho both only barely better than nagel (31,32 mf))
I pick up any rune, any flawless gem (in a playthrough also chipped for cubing demonhearts)
i pick up any magic orb in hell, for the +6 enchant orb
rare amulets are probably a waste of time(except from diablo, nilathak baal), since they can't spawn +2 char