Throwing Barb

[SetBuilder]

I think this is a case of counting chickens before they hatch.  Jahs are really, really rare.  You can just assume you'll never find one, unless you trade for dupes.  So the question of what you'd do with it if you had one never really comes up.

That said, putting it in a plain slayer guard would really be a waste.  If you make it in a barbarian helm, no one but a barbarian can ever use it.  And if the helm doesn't have any skill boosts, and doesn't have high defense, there's not really a reason to put in there.  You'll find many, many 3 socket helms before you find a single Jah.
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For this reason I'd actually recommend Delerium. Delerium is EXCELLENT for a throwing barb, as you can see:

Delerium: Lem + Ist + IO

1% Chance To Cast Level 50 Delirium* (morph) When Struck
6% Chance To Cast Level 14 Mind Blast When Struck
14% Chance To Cast Level 13 Terror When Struck
11% Chance To Cast Level 18 Confuse On Striking
+2 To All Skills
+261 Defense
+10 To Vitality
50% Extra Gold From Monsters
25% Better Chance of Getting Magic Items
Level 17 Attract (60 Charges)

And would actually be halfway decent on your slayer guard, due to the +261 Def. The only downside to this helm is the Delirium itself, as morphing into one of the exploding little bone guys would blow. Unless it's your merc, as then his dying would accomplish something.