Some price checks plz

Kind of new to selling/buying, so sorry if some of these items are totally worthless :-(

Insightful staff head +5 energy (guessing 2 maybe 3k)
Defensive staff head +5 armor
Rune - superior fire magic +3 fire skills -75 health (4 maybe 5k?)
Rune - major fire magic +2 fire skills - 50 health
Hale earth staff of warding: 1/2 recharge 20%, req 9 earth, 11-22 dmg, 1/2 time cast spells (10%), health +27, armor +7 vs elemental

Also was wondering how much a req 9 max dmg fellblade would cost.

Also one question I have - I have been salvaging pretty much any good mod, but i have also seen people sell the item with a good mod. Is there some sort of generic rule of thumb so u know when and when not to salvage the mod? i'm just wondering cuz im guessing in some cases its better to leave the mod on it in terms of value.

thx in advance for any help...also kind of assuming most superior runes are worthless but if theres any that are that would be nice to know (havent found a rune pricing guide anywhere).

sticky for upgrades:weapon mods pricing
rune trader for runes
10k staff

ok thanks. i already knew about the weapon mods link but by most accounts, the list at the beginning is outdated so that's why i asked anyway.

good to know about the staff.