Night Elf Priest Racial Talents
Shadowmeld - Granting you a stealth similar to Rogues, this can be somewhat helpful in PvP. The downside is that you cannot move. As a Priest, this is absolutely useless in PvE but can give you the upper hand in PvP.
Quickness - Gives you an additional 1% chance to dodge. Theoretically this increases your survivability, but the amount is so marginally small that it is not a justifiable reason to play a Night Elf Priest.
Wisp Spirit - This ability allows you to run to your corpse after death faster, slightly decreasing downtime. Not a reason to make a Night Elf Priest, but a neat racial talent.
Nature Resistance - This grants you +10 natural nature resistance. Not a reason to choose a Night Elf Priest, but again, not a bad bonus.