This mod changes your Spectral Assassin into Silent Shadow Assassin (v.1.1), less talkative Shadow Assassin (v.1.0) or "talk only in combat" Shadow Assassin (v.1.0).
Also I gave him two ebony daggers.
Changed class and combat style to Assassin (I hope combat style make some difference) :)

CHANGELOG:
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26.02.2012
1. fixed silent Shadow Assassin. He now says special phrases when you're on Dark Brotherhood quests.
2. added new file with less talketive Shadow Assasin (see description below)
3. added new file with "talk only in combat" Shadow Assassin (see description below)

DESCRIPTION:
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LESS TALKATIVE SHADOW ASSASSIN:
1 - phrases about cities (Windhelm, Markrath, Solitude, etc.) have bigger cooldown now - 12 hours (up from 3 hours)
2 - deleted pharses like "Yeah!", "Urgh!", "Aaahhhhh...." etc. during combat.
2.a - reduced GetRandomPercent condition for combat phrases to = 5% (down from = 10%) and to = 20% (down from = 30%) which make assassin talk or not on every asassin's attack, hit, or death.
3 - deleted 9 misc phrases:
"All hail the savior of the Dark Brotherhood! All Hail the Listener!"
"One day, you will serve our Dread Father as I do now."
"I live... again."
"I grow restless. As does my blade."
"Your enemies will soon know the wrath of Sithis."
"In life, I was but a Speaker for the Black Hand. But you have been named Listener. There is no higher honor."
"Have you heard the tale of Mathieu Bellamont, and the great treachery of Cheydinhal? Kill a boy's mother, and vengeance festers in the son... "
"The Dread Father works through me. And his work has just begun."
"My Listener?"
3.a - to the rest 8 phrases added the GetRandomPercent condition with hard equivalence ( == 10% for one phrase, == 20% for another, etc.) This make assassin talk much less.
4. - Assassin does say special phrases when you're on Dark Brotherhood quests.
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"TALK ONLY IN COMBAT" SHADOW ASSASSIN:
1. - Assassin does say special phrases when you're on Dark Brotherhood quests.
2. - deleted pharses like "Yeah!", "Urgh!", "Aaahhhhh...." etc. during combat.
Enjoy!
2.a - reduced GetRandomPercent conditions for combat phrases to = 5% (down from = 10%) and to = 20% (down from = 30%) which make assassin talk or not on every asassin's attack, hit, or death.
3. - all misc phrases are deleted. Including phrases about cities (Windhelm, Markrath, Solitude, etc.)


My another mod: Poison: Embrace of Ice