My gear (mostly T1) has around -5% hate and find that it's hard to grab aggro from most mobs (unlike the ToS). Phase Shift and Hands is my "Oh Shit!" combo if I do get aggro

My 1.05 build drops Archmage (as it's now pointless in 1.05) and does feat for the extra -hate due to the hate mechanic changes...
Oh - and around 10-15% of my normal raid damage is electrical...so Archmage for pre-1.05 is good for me (as is my gear - all of it has +fire, +elec and/or +magic dmg)

I use the Electrical attacks when 1) my main Fire attacks are on cooldown, 2) when I want to avoid splash damage (non-feated Electrical attacks don't have splash) or 3) when fighting something with high fire invulns (normally PvP) or lots of adds (another AoE and CC always helps).
/edit - just perused my old combat logs; my best run with this build was a Kylikki run with 2.2million dmg dealt (next place was 1.3 million) - 65% of the damage dealt was Fire, 35% was Electrical
So there
