Thanks so much for the input on the Casseroll and also on the compact double.
I have to admit that the compact double is my biggest concern about the Pacer. I'd call myself a mid-level rider in that I can definitely power up short, steep hills or get up to a fast pace on the flats even on my single speed.
However, I really would rather not be struggling on the longer more gradual inclines I expect to encounter on my rides. I have no idea how a compact double handles hills.
The LBS said it would cost about $200 to change to a triple. That brings the bike to $1500, well over my budget!

Andy_K, the blue on the Pacer looks even better in person! It really is a lovely bicycle.