The mage classes get ID on 2nd tier (at least sorceror does) you might check them out. Arcane Magic is very powerful.
Rogue isn't the strongest. If you have the time to kill them with backstab (you get nether summons distracting or they frozen with arcane) then you could probably just kill anway without backstab. Ranged combat isn't rewarded except in a couple of places where you kill high xp oponents in an unreachable location.
I don't know if any celestial classes get ID? I'm curious about celestial I haven't tried it as much. I like my blast nova too much
Fighter doesn't. But is great due to getting weapons and armor skills. celestial/mage is probably a strong combo (with one or both battlemage or paladin for some fighting)...but fighter with either celestial or arcane is also good because the beginning of the game is easier when you can wear some heavy armor and wield the strongest weapons you find.
But you really don't need ID gold is not hard to come by just pay to identify. The only place you need identify maybe is in the sewers. You can still equip unidentified items just research on gamebanshee what stats you need to wear them with no penalties.
Plus with experience you can fight your way through the sewers naked maybe just a shortsword (which doesn't degrade).