Replacement for HP Designjet 4000

I work in a GIS department and we are looking to replace our HP Designjet 4000. It has been a great printer but is starting to show its age and starting to have some problems. This printer was purchased about 12 years ago and we would like a printer that will last and produce quality prints. We print Aerials and line work drawings along with some generic posters. We mostly use 36" wide paper but sometimes produce 42" wide prints. What would be your recommendations for the replacement?