Love this character type, but im usually on the other(eveil ) team.
Try using Spontaneous Domain Casting from the PHBII. It ditches spontaneous healing spells for the ability to cast fspontaneously from one domain of your choice.
Stack this with Domain Spontinaity if ya want.
Also try Divine Magician from Complete Mage. It trades one domain for the ability to add one Wizard spell from the Abjuration, Divination, or Necromancy schools to your list at each level that you gain new spell.Basicly, nine spells, added to your list from the the wizards list.
The choices are awsome.If you want to be cheesy, ditch the Knowledge Domain and keep the Spell and Magic.
When using the AnySpell Chain, remember that the Spell Compendium version is better in some ways, since the Arcane spell can come from any source, and need not be translated into anything you can understand.DM may nix this as cheesy.
Also consider becoming a RuneCaster, for the some of the best item creation in the game.
Consider going "naked" at higher levels, if only to benifit from a Monks Belt, along with your Mage Armor.Go this way, and anything you do to raise your Wisdom will add to your AC too.
Mystic Wanderer has Chariasma to AC,right? Good Turn/Divine metamagic synergy there.
At low levels consider The Hide Sheild for +3 AC and the option to take full cover, without the weight, expense of a Tower Sheild.
Dweomerkeeper can be qualified for via a first level Regional feat. Check out the Wotc CharOp stickies and look for the Cheater of Mystra build for details.