The 1HS+Shield vs 2HS Shadowknight debate

[Snaggles]

Agil = Slightly effects AC. Sub 75 is a penalty, not a problem for you as a DE.
Dex = Procs. Not sure if self-procs use it as a factor.
AC = mitigation from melee attacks
HP's = obvious
Stam = similar to hps
Str = attack

It kinda depends on what you want to do. If you are a classic grind group tank with a cleric then hps > all. If you are duoing melee mobs and not taking CH then AC is very handy. For reverse kiting AC is also nice in that those fear breaks will be less painful.
Str will speed up your kills a bit but not nearly as much as haste or a good weapon.

I'd stack AC and HPs whenever possible. Have enough str so you aren't always encumbered (hero bracer is a solid cheap add). If fashionquesting some Dark Forge and the cheap Blood Ember slots, hp rings, etc.

And if it's not already obvious for 200p a nerfed circlet of shadows is awesome. It works 25 levels before the BE Bracer and is a faster cast.