The Mage of the Arcane Order and Watchful Order of Magists and Protectors prestige classes suck up too much of a wizard's identity and offer too little in return. The spellpool is an interesting feature, but it is by no means awesomely powerful. Characters wanting access to a spellpool are expected to commit ten levels to a prestige class that has many drawbacks. Here is an alternative, the Order of Thaumaturgy. A simple and flavorful 3 level class.
Spoiler: See the Guilder of the Order of Thaumaturgy Prestige Class
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