This has worked in several games that allow you to designate your stats how you choose, such as Diablo 2 and mana-tanking sorces for example.
Awesome potential! Dig this concept-- 100% magicka. Instead of putting any points into health or stam put ALL your stat allocations into Magicka. Then take healing/damage reduction/absorption spells in one weapon slot and damage/(de)buff/CC skills in the other weapon slots... seems like it could be good for increasing EHP quite a lot, and this is how:
You regen stats based on how much of the stat you have, because it's % based. 5% regen per second or so (haven't timed it while watching videos yet, but I will sometime soon!) (Templar also gets 4% magicka back per spell cast..which has the potential to make your magicka nearly endless if you are casting spells around 10% your max magicka [which is low, but if you're in full light armor and such then this number goes up and your max magicka should be quite high] at 1 spell per second endlessly!!)
So..now..the only thing you need to worry about is being one-shot to death, but unless a couple nightstalkers snipe you from stealth who are fully bow-damage geared, I doubt this will happen anyway. I mean, SOME HP allocation might be required to avoid being one-shot, but I think this really has potential.
If you were a mage (they have incrs magicka, magicka regen, and lower magicka costs, too) then think about being able to Lightning-Teleport (forget the name right now..) so many times in a row, this could even be faster than a stamina templar with a bow and medium armor!
IDK, it's just something cool to think about-- since I haven't talked a whole lot about health/magicka/stam distribution as much as I have on spell synergy combos.