I JUST finished this sweater -- I haven't even taken pics yet. I used Shepherd Baby Wool 4-ply (it's a superwash, too). It was not too expensive, especially since I made the whole sweater (coordinating color and main color) with 3 balls. In fact, I think I have enough yarn leftover for socks.
My gauge was dead on with this yarn on the recommended 3's.
It's a beautiful sweater! Have fun!