They sure are

Barb:
Heart of Iron - Chest (U are looking for double socket / high stat rolls / regen / phys res)
The Undisputed Champion - Belt (Again double res is good here with high stat rolls)
Slave Bonds - Bracers (Only Ms bracers, must have -levelreq, High stat rolls) <-- good on all classes
Gungdo Gear - Bracers (High Stat rolls, Double res is best.)
Cains Memory - Helm (60+ Str, 60+ vit, crit / regen)
Denial - Shield - EXTREMELY RARE (Needs -Lvl Rq and i think only controller has a good one)

Witch Doc:
Quetzalcotal** OR W/E ITS CALLED - Helm (High stat rolls, has attack speed)
Everything else i think is best as a Rare.

Monk:
The Minds Eye - Helm (Needs - Level Req, Has attack speed)
Heart of Iron
Chaingmail

DH:
Dunno any, sum1 else fill this one in

Wizards:
I honestly think rares are the best in most slots on wizards.

There u go.

I got another shield for my barb, it was very cheap. It's called wall of bone, it has a socket and 20@ and some vit or str, can't remember which. I'm assuming the 300 extra armor denial gives u is better than 20@?

I have a rare shield with 119 vit / 58 str / 14 phys res / socket

The stats u give up to wear a Wall of Bone are too much to be a good shield sadly :S

And yes denial has % Life, High Armor, More Block value and i belive CC redux.

You mean LLB low level brawling.

Currently zero level reduce denial's on AH.

Also, what pieces of gear can have additional armor on them on our level? I assume all res is out of the question, what single res is the best?

helps pots alot.

50% more hp from pot every cooldown is extremely effective in clutch fights

Things cant roll all res or armor for the most part, Phys res is what u want if your building a barb. Move speed is important for fighting anything ranged. Obv Phys res becomes less usfull against wiz / WD but its still the best thing to stack IMO. I guess lots of poison res might be good for WD's, but i dont really know.

Click on the link under my sig and take a look at my barb, i think im close to one of the most geared barbs at level 30 at this point. Might help.

No pots in LLD my good man

Hmm most of the items you have are not available on the AH, did you craft/find them yourself? Ifso where and how long did it take you? I was hoping to just pour in a couple hundred million and get a GG dueler but I guess that is not the case

I'm actually more interested in a Wizard. Are they viable?