Coming from a player who only has SC experience with an Archon build, I'd go with a shield in HC. Unless you'd had 70k+ HP, some more DPS and life steal, then I'd might reconsider. Speaking of which, have you tried Blood Magic instead of Force Weapon for some life steal instead of LoH?
I'd personally also feel safer running with this build in HC if I had enough DPS to quickly kill everything without Sparkflint. Right now you only have Diamond Skin as protection when not in Archon form. I'd feel safer with Teleport as well. But in your situation I'd use Sparkflint too.
That is reassuring. I have been scrolling some oculus on AH and wondering if i should switch my shield for it.
How much dps you have with the shield? 30k? I`m wondering when it would be safe for me to switch from blizz-hydra to archon build. Could you give me a quick skill-rundown for your archon build as well?
EDIT: Also what kind of shield you are using? I have 2 options and basicly pondering between more all resist and high bonus armor mode or 7,5 crit chance with less armor and res. Is crit chance must for all wizard shield?