R/ME i need 3 dmg skills

[saeben]

I need some advice on this build ...
Currently runnin r/w...but i am gonna switch to mesmer sec (is it possible to switch classes before asending?). Basically I'm gonna run

3 defense (super AC)
Greater Conflagration (elite)
Winter
Elemental Resistance or Mantra of Frost

2 utility
self heal and rez sig (must bring these in random 4v4)

3 attack
for PVP was thinking Conjure Phantasm + apply Poison + Hunter Shot
for PVE Tigers Fury + Ignite arrows + Dual Shot

I need advice on which 3 attack skills to bring..keep in mind my elite is already used so no quick shot or barrage.

[Reikai]

my suggestion. Drop greater conflag
drop winter
drop mantra of frost

reason? dead spirit = dead build = 3 useless skills.