Anything with good sustain. I use the same pve build, spc with worm and monster helm. Unlimited heal, low dps though.
5 trans - jewels + Snb back bar
2 troll king
5 heavy julianos/kags (body pieces)
Masters resto - front bar
Imo
In addition to sets I think it's important to be a vampire. Elusive mist is really useful for re-positioning in PvP especially as a healer where you're top of good players kill list. I've two templars and the one that's a vamp is the only one I PvP with now. When I try to PvP on the other I die way more.