Psychic Scream + Fade will give you time to escape a lot of bad situations.  Enchanting your boots for speed helps as well.

To the original poster:  For solo and PvP builds I recommend going down the DSC tree far enough to get Imp Shield, Imp Fort, and wand specialization.  A few points spent to improve the damage of your SW:P/mind blast are well spent too in the early to mid lvls.  Then start down the holy tree. When you respec in your 60's you can drop the shadow points all together to get a bit deeper in the holy tree, or pick up a bit of survivability.  Your choice there will be determined on whether your holy priest does more raid healing or PvPing.  I'd spec more heavily in disc for PvP and more holy for raiding.

Just my 2 coppers :)

Best of luck!

when you're soloing, Fade does nothing. zero. zip. zilch. if you are the only one on the mob's aggro table, dropping 20% does nothing.

[quote]
when you're soloing, Fade does nothing. zero. zip. zilch. if you are the only one on the mob's aggro table, dropping 20% does nothing.[/quote]

Actually it does.  It lowers your body aggro so you do not pull as many mobs as you otherwise would during your hasty retreat. 

This is not true.  It reduces your threat, it does not reduce your aggro radius.  The spell that reduces aggro radius is Mind Soothe and you cast it on mobs, not yourself.

FWIW, I HAVE experimented with this, and I would hope you would do the same.  Find a mob, prox aggro it, run away.  Wait for it to reset, fade, and prox aggro it again.  You will not get any closer the second time.

[quote]
This is not true.  It reduces your threat, it does not reduce your aggro radius.  The spell that reduces aggro radius is Mind Soothe and you cast it on mobs, not yourself.

FWIW, I HAVE experimented with this, and I would hope you would do the same.  Find a mob, prox aggro it, run away.  Wait for it to reset, fade, and prox aggro it again.  You will not get any closer the second time.[/quote]

In the Gruul pull I have faded and run to the spot we want the mage tank to run to at the pull (just slightly in front of the steam vent on the right side).  I don't pull aggro.  The mage tank, however, if he runs up there a fraction of a second before the pull, gets pwned when he aggros the whole mob. 

I suppose it is possible that it is the subetly to my cloak reducing my aggro radius and not fade?  Though I wouldn't think a 2% subtractive would be sufficient.