The HP Designjet 700 series plotters are great work horses used heavily in engineering and architectual environments. The Designjet 700 is a black only plotter with virtual 600dpi resolution. The Designjet 750C is a color version of the Designjet 700 and the 755CM is a PostScript version of the Designjet HP 750C. The HP Designjet 755MC is fully loaded and cannot be upgraded - excellent printer.
HP no longer supports the Designjet 700 series and parts are becoming difficult to find. The HP "T" series plotters are excellent replacements for the 700 family.