Assuming you're not using Event Horizon, which Black Hole rune do you think is better for Firebirds?
Spellsteal's damage buff is pretty significant, but Blazar's 1400% Fire damage is nothing to sneeze at when combined with Firebirds.
1H vs 2H
The Firebirds DOT doesn't use your attack speed right? So a slow 1.1 APS 2H would have a near 30% DOT damage advantage over a 1.4 APS 1H + Source combo? Combined with the 23-26% 2H damage buff, would it be worth using a Maximus (or some other 2H like Furnace) over a 1H + Source (assuming you don't have a Woh/Sparker)?