I've been doing alot of Abaddon runs lately but I don't have much of a clue of which types of things to save for the other classes besides MM/Eng. Obviously All Attributes is always good, but anything else you can tell me would be great.

So what things would I want to keep for :

Blademaster
Guardian
Evoker
Summoner

Mainly:
What are the most desireable skills on weapons and shields
What are the most desireable mods on armor

blademasters and guardians gotta be phase for weapons. phased monsters are a lot easier to deal with.
if your ranged, go for ignite is my guess.

the bm loves life and res on his items, they need survivability. shields are pretty much useless here

engineers like +minion stats and shields on armours.

anything else and the guesses get more inacurate.

bm i say u need sheild penatration and sheild over load

yes, shield peno is handy, though I like to take out the fukers that supply the shield 1st and not deal with shields at all.
I guess that comes into personal play styles.

overload I've never looked into, I get by without it. basic monster shields (not the force field type) usualy will not survive half a hit.
most monsters die 1 hit of similar level, 2 hits for the tougher normal monsters(surge of rest hits)