If yu want to try the whole healbot thing roll an Undead or Blood Elf priest (troll is a mediocre choice from experience) also when you are able to run instances, run with a lock that doesnt know what aggro is, and loves to lifetap (ran into this in SFK and ended up with a locktank 3/4 of the time)

I personally want to roll  Blood Elf lock.  I have tried melee classes, and find that im not good at moving and trying to keep things in front of me.  I have a lvl 18 warrior on Thrall (Mmoo).  I have a 29 Undead mage (Dalmchd) and  while the burst damage is great, it has zero sustainability and lots of down time.  

I also have a lvl 18 twink shaman (Eaterovdawn) that still needs some upgrades.  Twinks are a fun waste of time and gold, but a necessary evil  :twisted:  to get any enjoyment out of lvl 10-19 WSG.  I have 800ish hp and still get twoshotted by rogues that proc crusader...

I also considered a BE paladin or a druid, but I allready have a healbot, and know that is what either of those will become eventually.

btw it is very difficult to solo as a priest, and the first 15 levels ona priest are completely boring...gl