So we know that sPvP is completely different than PvE and WvWvW. Here is quick short list of what people run in sPvP. Traits are in section 3 of this guide.
D/D builds (mostly everyone runs D/D):
0/15/10/15/30
0/10/0/30/30
S/D and Staff setups (not sure how viable fresh air is in sPvP though):
0/30/0/10/30
Gear for D/D
Valkyrie Amulet w/ either Berserker or Soldier’s Jewel.
Sigil: Sigil of Geomancy. 5% more damage.
Runes: 6 runes of the ogre
Skills for D/D
Ether Renewal or Signet of Restoration
Mistform. Arcane Blast. Arcane Wave. Possibly Lightning Flash, armor of earth, cleansing fire, or conjure hammer.
Glyph of Elemental or Fiery GS. Possibly Tornado.
Gear for S/D and Staff: (not up to date on this):
daphoenix's Elementalist Guide 