Disc:
T1: Hmm, probably tendrils, Psyfiend also tempting but need to find out if it works with glyph
T2: Body and Soul, though I expect they will nerf it slightly (to 40% or something)
T3: Either star or AA, personally not a fan of the RNG in FD,CL
T4: Depends on fight
T5: Again depends on final numbers, with current numbers PI
T6: Totally depends on the fight, though Vow looks a little weak
Shadow:
T1: Tendrils
T2: Phantasm (lots of people are undervaluing this I feel, I spam Fade like it's going out of fashion in raids)
T3: Divine star cos it's shiny.... and glowy... and ooooh
T4: Final prayer
T5: PI with current numbers
T6: Depends on the fight