True though lets not forget though that modern historical theory shows that if you had to wear any sort of heavy armor in to battle if you had to walk more than half a mile in it you would be so tired that your fighting force would be rendered incompetant. Which can if used by a proper stategist negate a lot of the "awesomeness" of heavy armor. that is if you make your troops play an endurance war with their heavy infantry.
Not true. Yes, they're (marginally) heavier than chain, and much heavier than padded cloth or leather armor, but anyone in fighting trim could run, jump, tumble, ride, and be combat effective in a suit of plate, no problem.
A full suit of Gothic plate, which is generally what people think of when they think "full plate", weighs about as much as a Marine's combat loadout, and is
much better distributed over the body. The articulation of a properly fitted suit is also good enough that it's less cumbersome to move in than many other forms of lighter armor, further equalizing the equation.
And that's not even considering that the people that could afford full-plate generally also had a horse to ride, and a few more on standby for when the first one got killed.
Sooo back on topic, I need to think about a spell list for this guy.
Okay, back to the topic...
Magic Fingers (obviously)
Levitate (ditto)
Stunbolt
Single Elemental Attack (Recommend "Screech" or "Boom")
Increase Reflexes
Healing
Improved Invisibility
Beyond that, it's all up to what kind of mage you want to be.