Due to guild needs I might be respeccing to Holy. What I would like to know is whether Holy/prot or Holy/Ret can still solo and do questing/grinding for reputation.
Although I suggest putting the 7 or 8 points into the retribution tree for Imp. Judgement. Makes grinding a bit easier. You can also take Imp. Blessing of Might this way. The rest should go into the Holy and Prot tree, especially for Kings.
Holy/Prot is better suited for BGs/Arenas. You are trading potential DPS for the added survivability. You can still grind but it will take much longer.
Holy/Ret is the way to go for grinding/solo play. Faster grindage. Less survivability.
The only really solo fighting I do anymore is on the flayers for the netherwing daily quest in the mine. I am no rogue, but I kill stuff. Fights are slow but down time is pretty frickin low.
Anywho, I solo fine. Only time I've recently had problems was with the voidwalker mobs that become highly resistant to the first spell school you attack them with outside Manaforge Ultris.