Is there a particular reason you went with MotAO? It never seemed like that great of a PrC to me, but I might just be missing something.

My current Batman (in Core-only, though) is working toward Diviner/Loremaster/Archmage (not sure about the levels of each), also barring Evocation. Loremaster's 1st (or maybe 2nd?) level, if you have a high enough Int, can grab you an extra feat with one of your Secrets, so that makes it easier to grab other PrC prerequisites. I'm playing a Gnome, so I didn't get that Human bonus feat, but the Loremaster works fine to replace that.