Im wouldn't spent anything on it. Shieldbreaker is fun for a bit but there are better V14 armors around. Also it is bound to be nerfed someday since ZoS likes to throw around the nerf-hammer after hearing to much complaints about OP this and that.
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"I am a nightblade. Blending the disciplines of the stealthy agent and subtle wizard, I move unseen and undetected, foil locks and traps, and teleport to safety when threatened, or strike like a viper from ambush. The College of Illusion hides me and fuddles or pacifies my opponents. The College of Mysticism detects my object, reflects and dispels enemy spells, and makes good my escape. The key to a nightblade's success is avoidance, by spell or by stealth; with these skills, all things are possible."
Buy sets and mats and sell them after day one you can buy the gear you want to wear sell the rest or just IC for the AP I stopped caring about stones like two weeks.
Chaos Shadow-Scale: Shadow Archer
Chaos Death-Scale: Shadow Knight
Tanks-With-Sap-Essence: Dark Mage
Dark Brotherhood Listener: Blade of Argonia
Chaos Dragon-Scale: Draconic Shield Master
Chaos Light-Scale: Marsh Paladin
Chaos Lightning-Scale: Daedric Master
Hurricane Chaos: Storm Archer
Bask-In-My-Light: Warrior of The Light
Forged-In-Dragon-Fire: Pyro Mage
Guardian of The Hist: Light Mender
Chaos of Black Marsh: Master of The Burning Sword
Star of Chaos: Frost Blade Champion
Chaos-Lightning-Tower: Lightning Shield Master
For the King of Argonia
May Sithis hold back his Void