I'm not seeing any real compelling reason's in this thread to not wait.
1. Multiple times during 2007, you grew tired of beign low-DPS holy priest and "went shadow" you always came back to holy healin' Avesther. Lesson: save yourself some money, you'll always come back to healing. If you wanna shadow while ya level, that's a different deal ... maybe I'll go feral while I level too, just for fun. But don't throw away your healing duds, I expect you will need them...
2. Questing around HH in TBC was a nightmare ... too many toons, not enough spawns, and both factions stacked right on each other for gankfests. And, oh yeah, the "no life in RL" hordes who quickly leveled had flying mounts and would "gank from above" to make it even worse. But that is something that went away within days, almost. Lesson: post-patch gankfests are temporary
3. Right when TBC came out, I have some memory of you having some massive repair bill after your first HH quest because you were wearing purples and you then considered a radical change in gearing strategy. I think all that passed pretty quickly for all of us as we quickly upgraded to TBC gear. Lesson: Again, anything that happens the first week or two of an expansion is a poor predictor of future state. A lot of these equilibriums quickly go away.
4. You are one of the leetest healing priests on Stonemaul. Big fish, big pond. Lesson: is going to a carebear server really going to be rewarding for you? You'll still be a big fish but the water will be awfully shallow.
5. You have a Shadow Warrior in WAR so if you get frustrated, just log on to WAR and take out your frustrations with swarms on arrows into Destro.
Summary:
A. Temporary spreist: yeah, that's probabably not a bad idea.
B. Permanent spriest: heard it before, I don't believe it
C. Switch to PvE server: you have GOT to be kidding me.
