[Faceman]

As a spellcaster planning your HLAs is not as important as it may be with Rogues or fighters as they basically are (besides some choices) high level spells which you can choose once to get them into your spellbook.
A fighter or rogue has it more difficult to decide which ability he wants how often per day. So while many people will pass of abilities like Deathblow or Warcry for their fighters (or take only one for roleplaying purpose) you will eventually get all mage/sorcerer/cleric abilities (and can't choose any more after leveling up the next time).