First, Shadow Cloak and morphs of it are "vital" for NB character - my best is Dark Cloak which removes DoTs (very usable in PvP). Rest of skills are "free" to pick depending on where will you stay, PvE or PvP... but, skills that i will not recomend at all - Consuming Trap and Blood Craze. DoTs even those stamina based are quite week (Venom Arrow is used mainly in combination of light/heavy attck), especially bleeding type like BC (many monters are immune to that/point shield prevents from DoTs[?] - dont remeber rightly), BC is only appliable in close range of 5m, and when it comes to Consuming Trap.. umm.. worth attention only when you need to fill empty gems, unlucky nothing more.
But Swallow Soul for stamina based characer is... quite weak - healing from it poor and scales with damage done, which comes from spell powah/max magicka. About Dark Shades, cant say much coz i dont know that damage done by silent shadow scales off with stamina/magicka or dont at all, however hmm... without it you have more magicka to hide yourself . Relentless Focus gives nice bonus to ST regen and adds some weapon dmg . And Camoulfaged Hunter - good skill for striking from stealth, "wickeds" are easier to see, more crits and % chance of dealing additional damage.
At the end will add that much better (in my opinion) is Incapacitating Strike in replacement of Soul Harvest - why? - can knock down opponent with higher health, and "bonus" ulti gain you have from using from time to time light and heavy attacks. Also you can pick very popular Mass Hysteria if you like CC.