Ideal 6L Supports for Power Siphon?

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haplessG00N wrote:

I actually used gmp/pierce instead of chain and cast projectile weakness for 100% pierce. You don't get that nasty 50% less damage from chain so you can stack ailments easier and it cost way less mana so you can drop some mana and regen passives. More effective IMO!

Can this be done to where it is essentially your single target attack as well? I have a build planned out, and I was trying to fit Life Leech in there, but I might do it via a single target attack. I have CI/Ghost Reaver so that's why the Life Leech. Maybe use the single target attack for damage and them switch something out in the AoE version to add in Life Leech. I think this is the last real question for me in terms of planning the build. If Life Leech goes into the AoE, does something like Faster Attacks or Pierce go out or something else? FYI, this is a Witch build, but the issue remains the same.