You want around 15-20% haste to play comfortably.
You want around 20-25% haste to play comfortably.
Always sim your character to get proper information on your BIS gear and stats.
Intellect: Raw damage increase on everything.
Haste: Increases cast and tick speed.
Mastery (Mastery: Potent Afflictions): Increases damage done of most of your damage spells.
Versatility: Increases damage and healing done and decreases damage taken.
The best way to calculate stat priorities for your character is to "sim" your characterFind out how to sim
Orc > Troll > Blood Elf > Goblin > Undead > Vulpera
Mechagnome > Dark Iron Dwarf > Gnome > Human > Nightborne > Void Elf > Worgen > Dwarf
The difference between the races are very minor so you can just choose what you like the most.
Chest - Eternal Stats
Bracers - Eternal Intellect
Cloak - Fortified Avoidance
Flask - Spectral Flask of Power
Potion - Potion of Spectral Intellect
Health potion - Spiritual Healing Potion
Oil - Shadowcore Oil