I made a twink priest:
http://www.wowarmory.com/character-sheet.xml?r=Khaz%27goroth&n=Pashmyna
She is by no means a complete twink (no fishing gear, AGM, Talbar), but she is alot of fun. I have a stamina set that gets me to 1400ish hp, but I rarely wear it anymore. My build is a bit unconventional as well (most twinks take the stun resistance in the Disc tree, but I like the occasional stun proc off SW:P).
I have never seen a 19 twink spriest, but I have seen a few healy ones. It seems to me you are better equipped with spell options at 19 to be a healy priest for twinking.
Here is a twink priest that maxed survivability:
http://www.wowarmory.com/character-sheet.xml?r=Dath%27Remar&n=Pepper
I have seen Pepper in WSG and she is basically a raid boss. Great flag runner, but not much of a healer.
Anyway, twinking a holy priest for 19 wsg is a blast!
GL
Cheers!
oh and one other thing - as a twink healer you will be VERY popular!
Edited, Feb 19th 2008 9:14am by Tiq