Reccomendations please!

I am looking for a commercial quality inkjet that can print 12"x18" architectural drawings quickly and efficiently & occasional color renderings (of 2nd importance). I have had several epson's in the past, and while I like their image quality, I find they get clogged easily and the build quality is not great. As I am looking for a printer for an office environment, I was hoping you guys could weigh in to help me out. Most reviews focus on the color quality and not necessarily the B&W speed and quality. Right now I am leaning towards the HP B9180 because of its enclosed paper tray, network capability & build quality. I think it might be fast at b&w line prints but I can't be sure.
Thanks a lot.