Warning: Long topic is long because some borderline-OCD computer nerd likes making builds.

Basically, I've been leveling as a pure mage with aspirations to have my Dunmer woman character become a Nightblade. Before we begin, here are my mods:

MODS: Better Magic, Deadly Combat, Deadly Dragons, Better Bound Weapons, Extensible Follower Framework, Bound Daggers (Better Bound Weapons Compatible), lots of cosmetic and texture mods, The Dance of Death, Weapon Variants Expansion, Apocalypse Spells, JaySuS Swords. Path of Shadows

And here's the build to work with these mods:

One-Handed:
-Armsman 5
-Dual Flurry 2
-Dual Savagery
-Fighting Stance

Sneak:
-Stealth 5
-Deadly Strike
-Assassination
-Exsanguination
-Silence
-Silent Roll
-Dodge
-Obscurity
-Evasion

Alteration:
-Novice Alteration
-Apprentice Alteration
-Adept Atleration
-Expert Alteration
-Master Alteration
-Mage Armor 3
-Stability

Conjuration:
-Novice Conjuration
-Mystic Binding 3

Destruction:
-Novice Destruction
-Apprentice Destruction
-Adept Destruction
-Expert Destruction
-Master Destruction
-Dual Casting
-Impact

Enchanting:
-Enchanter (5)
-Insightful Enchanter
-Corpus Enchanter
-Extra Effect

Illusion:
-Novice Illusion
-Apprentice Illusion
-Adept Illusion
-Expert Illusion
-Dual Casting
-Hypnotic Gaze
-Animage
-Kindred Mage
-Vital Mage
-Master of the Mind

Level Required: 61

Health: 400
Stamina: 200
Magicka: 300

Note: This build isn't exactly the most viable in vanilla Skyrim. For vanilla, you can skip Alteration, Destruction, and Enchanting for Light Armor, Archery, and Alchemy for the tried and true pure assassin character. This is just for something fresh.

I am wondering when I should: 1) Start taking sneak perks and 2) start grinding enchanting. Having Destruction spell cost reduction and Destruction spell power amplification (Deadly Dragons) is for one set of equipment and Illusion cost reduction and One-Handed boosting enchantments on another set.

Obviously, Sneak, Destruction, and Illuison will be my key skills. Conjuration for the bound swords and daggers and enchanting for the skill bonuses and cost reduction are secondary. The One-Handed perks will be allocated if enemies are getting stronger and Alteration will be mostly for Mage Armor (I'm neglecting armor with this build due to Better Magic's bonuses to Alteration). Obviously, the focus is on Health for stats but I am wondering where to cap Magicka and Stamina.

Any suggestions for this spread-thin build?

I too am building an aspiring Nightblade but am using a Dunmer male character i currently have all the Illusion, Sneak and Destruction (right side of the tree only) am working on the onehanded perks with just the first 5.

I started with sneak straight off and it has helped quite a bit.

I do not plan on using conjuration though but sounds like an interesting addition that i may add in the future. I am currently working on Enchanting and Alchemy so i can make poisons and enchant my gear.

this is my prospective build minus enchanting and alchemy as a i have a mod that removes the leveling from them http://skyrimcalculator.com/#127752