Are you guys thinking mostly PvP? I'd agree with the Stormshield in PvP. For PvM a dual wield for a WW Barb seems pointless unless you're going to try to help a party by sharing aura from runewords (Beast or Last Wish).
In PvM I tried some combos tonight, nothing extensive, just a few hell passes... I tried Grief/Grief, Grief/Phoenix, and Grief/Stormshield. I'll move over a BOTD and maybe a Beast tomorrow and check that out as a variation as well. Thus far I'm still sold on Grief/Phoenix.
I never take enough damage to worry about blocking being low, dual wielding wasn't really killing any faster, and if nothing else the Redemtion aura on Phoenix made it worth giving up everything else. I was WW'ing through skeleton archers near Shenk, and without Phoenix my mana rapidly dropped to Zero, leaving me to drink pots or switch to Concentrate (yuck). Switching back to Grief/Phoenix eliminates that problem, and frankly the critters died just as fast as with other combos.
Perhaps I'm just going against the grain, but if you haven't actually tried the Phoenix, then I recommend you do so one day. Maybe you'll like it, maybe you won't...