Well, what do we have right now? A Summoner (me), and Abjurer/Crafter (the good drhorrible), a Dread Necromancer (monotremeancer), and either an beguiler or a transmuter (flay crimsonwind). There's still a Diviner to be had, and then in terms of PrCs to tap there's Incantatrix (we need at least one), Anima Mage, War Weaver, Dweomerkeeper, and other random fun things like Sentinel of Bharrai, Dracolexi, or Escalation Mage. If you could houserule at least one more CL into Master Transmogrifist, that one could be a lot of fun as well for a transmuter.