Wizards are more powerfull then sorcerers, they have more spells (which you can choose for yourself) and have an advantage with their higher wisdom (high charisma is nice but not more then that) So Xan is right there, about all points, Meta is uber good, try a maximised fireball!!.
RDD is a fighter presitge class, don't pick it if you want to go with spells.
If you want to play with undead with the pale master, you had better simply pick a clerick.
All these classes are cool and ultimately you simply have to choose what you think is cool. Just don't expect a wizard / RDD to be strong in melee fights and a pale master to be stonger with undead then a cleric.