Mantras in sPvP?
30/30/0/0/0 +10
additional charge from Domination GM, additional 4% damage for each mantra from Dueling GM.
fill all your slots with mantras, use GS or sword (power weap).
And have fun to play with a sword of damocles above your head.
mantras, i think if you have not all ready listen to the latest mesmer podcast;
http://sittingonacouch.com/the-gw2-mesmer-podcast-mesmerized-chaosarchangel-part-deux/
they cover a lot of good facts about mantras and should give you some insight, i personally only use a mantra if i need the effect, not in any mantra builds as of yet but i will try one day.