[dentin]

You may want to give Alter Aeon a try. We have a rather large pile of spells and skills, with a lot of synergy and combinatorial effects between them. Examples of this off the top of my head would be charge spells that fire when using high damage initial attacks such as backstab; lightning bolt detonating previously cast ball lightning; and the intricate interworking of the necromancer skill sets.

Our necromancer class is probably the heaviest in this regard, in that nearly all of the necromancer skills are useful all the time; next up would be mage and cleric, which have a lot more spells than there are skills available for fighter classes. Because you can multiclass, you can get all the skills and spells from all of the different classes (if you dedicate enough time.)

-dentin