HP Designjet T830 eMFP or Canon iPF671 A1 MFP or 771 A0 MFP are entry level wide format multi-functions system. If scanning and copying jobs are critical for your operation, you shall opt for true wide format MFP system such as Canon iPF M40 series or Oce Plotwave 345 or 365.
However, if you require minimal scanning and copying functions but printing volume is reasonable high, Canon iPF671 A1 MFP or 771 A0 MFP shall fit into your consideration.
If scanning, copying and printing functions are also very minimal to your operation, you may include HP Designjet T830 eMFP as one of the option. The reason the T830 print engine is built from T520 platform but with much higher running cost.
Please watch below video for very professional and details analysis of the HP Designjet T830 eMFP and Canon iPF771 MFP.