Thanks for the advice.

Based on that I went for warlock instead of rogue. For me playing the priest unpartied felt like a bit of a waste, I enjoy levelling alts, so would rather do something productive for both characters, rather than just one (and my warlock got her felsteed). Took a bit of time to set up my lock, but hopefully learnt some lessons I can take over when I play my priest with my warrior (as so far she's been quite alright just targetting him for heals, but damage needs you to target mobs).

Ended up with lower xp/hour for my warrior, but considering it was for two chars overall I think it was worth playing both at once. Brought up a bit of another problem that I'll have which is my priest is fully rested, whilst my warrior has no rested xp, so she'll probably still be a couple of levels higher than him when they quest together.

One thing I am going to miss when I go back to my priest is my seduce macro, found it really handy to have cc on tap (except when I tried to seduce, changed target and then sent my pet to attack without thinking - still some learning to do, hehe)