My favorite EoR build is still demonbutcher.
Basically, steamsaws count as shields for the purpose of talents like Demon Seed, so you just get Butchery, Demonic Pact and further stuff that you like.
I recommend getting Demonic Strength personally, since it is very easy to keep up the vim for Abyssal Shield.
Also, Tempest of Metal works with Arcane Combat, meaning you can potentially get a lot of triggers - but you also run out of resources very fast.
Important Note: While steamsaws may count as shields for the purpose of talents, they count as mainhand for demon seeds - meaning you can get something like "silence on hit" + "Blood Grasp on hit" (my favorite combination.)
You can put a third weapon seed on your TK weapon (it's a staff, of course), so for instance I was rolling Corrosive Cone + Blood Grasp + Flame Bolts. Since the seeds grant the talents to YOU and not give them to items as on-hit procs, it doesn't matter if you're actually using BtF to attack with the TK slot or not (not).