I have yet to play any casting char that allows me to get to MQ as a pure caster faster than Mage.
I have yet to see ANY character that can beat me 1-30 when I am mage (I've dominated the early levels right after the last two resets, as the only proof I need).
I like your guide, however, I typically advice to focus on 1 build. If you're going to be a caster, be a PURE caster, and see just how badass you can make the build. Try to perfect it. If you're going to be melee, get your 3 weaponsets, your plate/scale/robe armor sets, and your charm set, and get yourself to the point where you can no-regen through all classes save alch.
Bah, my take, but seriously, fighter casters? Gag.
Still, nice guide though, and I enjoyed reading your reasoning behind it.