Since we are talking about tanking builds for wizards has anyone considered the amount of healing that a PM is capable of? Ideally one would want to be able to tank + aggro + heal (or at least emergency healing). Perhaps a docent of defiance warforged would fit the bill better?

PM get abbot shroud - dr 8 and lich dr 6 or wrath 25% incorporeal, which is probably better for survivability then the docent but warforges get quicken reconstruct which is better for healing.