I would go with Deacon, speed aura, turn meter manipulation and AoE decrease defense. Would work well with Athel. Or you could go Scyl, but I would still go Deacon first.
You made a classic mistake that almost all new players (including myself) do when they start playing. Instead of all those 50s you should have 3x60 instead.
As Arcllite said, either Deacon or Scyl. Personally I would go Scyl first and then Deacon. Both can still be useful at 50 so in the end it doesn't really matter which one you pick. I only say Scyl first because she enabled me to break through the wall I was stuck at because of her stun chance, passive heal, and revive.
THANKS ,,,, Deacon was my first thought,,
but like some said Scyl was bugging me because I use her lots
But I have noticed a Nice boost in a few dungeon lvls with Deacon ( Spider and Keeps )
CH was tickling my brain too , But YA,, Deacon then the rest will come easy ..........
and then there is DoomPriest .....