I received a lower-than-expected estimate of $1,100 from HHE, even with the Honda credit. I've also gotten a local quote for around $800, and I have another one scheduled for Monday. Since Iowa Electric Light and Power Company is offering a $450 rebate, I think I'll skip HHE.
The good news is that my electrical panel has enough capacity for a 60-amp breaker. I was initially concerned because I already have a dedicated 240V/60A breaker for the swim spa/hot tub, in addition to the range, dryer, and HVAC.