with wizard definetly go Sol Ro. Just about all its maricles and blessings have to do with heat-based damage spells. Which is like almost all our spells ;D
You can solo the Sol Ro (atleast at lvl 70) up until the end of the last quest where you'll need a decent full group. Its a pretty boring quest line :\ Lots of running and you have to make a few trips into the dreaded Soluseks Eye...I have a 48pct mount and I think this was too much running lol.