1) If you're a healer then there is no need to carry more than 2 heals. As long as you have one self heal, and one group heal then you're good to go. You're much better off just spamming the same heals over and over than trying to be cute about it.
2) The trinity will not hold up because EVERY PERSON WILL NEED TO BE THERE OWN TRINITY! This is so important. Regardless of how other MMOs are if you're not ready to heal, do damage, and take damage then you're gonna have some serious issues in PVP.
3) Arrows > Magic.
4) Sneaking makes you completely invisible. Not predator invisible but, invisible invisible.
My new build will be as follows. 2 heals, the gun from the fighters guild, the Templar sun fire projectile, and something from the bow tree to fill it out. However, I'm still debating on being a sorcerer instead because the winged twilights are bad ass.