The question is, if the Nibelung stealth-nerf isn't a bug, what will our new BiS weapon combo be?
[Frozen Bonespike] +
[Shadow Silk Spindle]
[Royal Scepter of Terenas II] +
[Shadow Silk Spindle]
[Tel'thas, Dagger of the Blood King] +
[Shadow Silk Spindle]
[Halion, Staff of Forgotten Love] (3 red sockets)
or
[Archus, Greatstaff of Antonidas] (3 red sockets)
The 284 mace as well as the staff both have clear spellpower advantages to make up for their deficiencies in itemization, which are what I'm leaning toward.
The staff's total spellpower (assuming a 9 SP socket bonus) comes out to be: 893+(141*.3)+(23*3)+(188*.12)+9+81 = 1125.56 spellpower. The mace + offhand combo comes out to (assuming 5 SP socket bonus): 893+119+23+5+63+((78+81)*.12) = 1122.08 spellpower.
So it comes down to the Staff's increased stats: 3.48 more spellpower and 18 crit rating, versus the mace + offhand's combined increased stats: 68 haste and 35 mp5. To me it seems like the clear choice will be
[Royal Scepter of Terenas II] +
[Shadow Silk Spindle], as sad as it is to wear mp5 gear.
Some math might be inaccurate, it's late and I'm sleepy!