Thanks, Andrew and Dave! Others suggested the HP design jet 800, too, Dave. I think it’s a popular one among architectural firms. We ended up purchasing the HP T790 44″. We are anxious to plot, so we went with the most cost-effective one that could be delivered ASAP. This one plots color–good for both CAD drawings and GIS color maps. The HP T790 is supposedly the latest and greatest, though it does not have scanning capabilities. It also does not print Post Script–we generally plot from PDF so this should not be a problem.
I hope this post is helpful to others doing plotter research!