Canon has the right large format solution for your needs. Canon now offers the imagePROGRAF line of large format printers. This new line has Canon's new 1.07-inch print head with a total of 7,680 nozzels resulting in uncompromising speed and quality.
Canon PIXMA iP7220 Photo Printer Part #:6219B002
Printer, color, Duplex, ink-jet, Legal, 600 dpi, up to 15 ipm (mono) / up to 10 ipm (color), USB, Wi-Fi(n) with Canon InstantExchange
Canon PIXMA iX6520 Photo Printer Part #:4895B002
Printer, color, ink-jet, Ledger, Super B, 600 dpi x 600 dpi, up to 11.3 ipm (mono) / up to 8.8 ipm (color), capacity: 150 sheets, USB with Canon InstantExchange