Assassin Questions

I've made a Mesmer... a Warrior... a Necro... a Monk... It's time for a Sin. I've trying to make my own build and I came up with this

1. Shadowprsison/Dark Prison
2. Blank
3. Blank
4. Blank
5. Blank
6. Healing Skill
7. Dash
8. Res

This build is made for a full around damage sin that also keeps him/her alive. I need your help to finish this. What should I put in the 4 blanks? Dash is for GvG btw. And if you ask for Dark Prison you need to think of an elite skill If you use shadow prison then your elite is already filled up. I'm thinking of using the skill format (After>After) You probably know this, Lead>Offhand>Dual>etc Thanks for your cooperation

~Yong

This one is used alot in PvP

Shadow Prison/Assassin's Promise
Tiger Stance/Lightning Reflexes
Black Lotus Strike
Twisting Fangs
Black Spider Strike
Blades of Steel
Expose Defenses
Res

Leave the healing to the monks.

That is pretty good for Hero Battles due to the fact I've seen LOTS of people use. But I only got Factions and Proph so I can't use Black Spider Strike. That is the problem. And HoTO>Falling Spider wont work either becauseif the the target is ACTUALLY adjecent to the target, you're in a position to run the heck away. But that start is what I was looking for. So yeah, Factions=Black ST=no Nightfall=Black ST=yes Thanks for your help though