Sorry, biased advice alert, I am the product manager for Xerox C & J75. I think you will be happy with a C75 for the front-to-back registration (we have a tool to create auto profiles for paper), productivity (up time, customer replaceable items like toner, fuser, when needed, and jam clearance), image quality (over the life of the press, auto density uniformity control), ability to auto duplex a 300 gsm 13 x 19 coated and uncoated sheet. You can see the different finishing and feeding options at
Xerox Color C75 / J75 Presses | Xerox Virtual Overview Tool. I am biased, a good unbiased way is do a search on both products on PrintPlant and see what users are saying (this is how as worldwide marketing manager we 'listen' to what printers are saying). For the C75 that replaces the Xerox 700 – so 700 is a good experience base (and the C, only offers improvements, but, is built off the 700). Good luck hope we can earn your business!