I agree, it was very appropriately symmetrical. I loved that moment, especially with the conversation that followed it. "Today you and your men sacrificed to buy me twenty six hundred priceless lives, all I had to repay you with was a single priceless sword, I call that a bargain" Hell yeah, Dalinar!
As far as moments that suckerpunched me, Taravangian was a big one, Shallan's shardblade didn't suckerpunch me but it did make me do a double take when I read the "ten heartbeats" line.