for brand wise OCE all the way I have used Cannons, HP etc. Get the laser style ones with toner not ink just in general its a lot faster especially if you aren't using colours. OCE seems to have less jams etc. I forget what series my office used but we could plot full A0 or E which ever like I'll say maybe a minute. with standard A1 I could send a batch of 15 or so and by the time i walked up one floor and got the room it be done the next print job after mine.