Best, most compatible multifunction printer/copiers for medium-sized office?

Hello world!

I have recently been tasked with selecting a NEW multifunction copier for our office! Our office consists of 30 to 40 users, mostly writers and graphic-designers, all running 10.6.8 or Lion 10.7.2.

We're interested in a B&W machine that...

• can print at least 50ppm
• can handle large file sizes with ease (for graphic designers printing InDesign files etc...)
• is first and foremost, VERY mac-friendly/compatible
• can scan multiple docs quickly, to an email or device, perhaps even scan in color

Currently, our office uses a Canon iR5570, Canon iR5020, and Xerox Phaser 7750DN. Support and proper software/drivers for the Canon printers is a nightmare. Despite trying every print method/driver/software/protocal combination possible and updating the firware, the Canon printers lock-up when multiple print-jobs or when large graphics files are sent to print. It's a very nerve-racking experience, especially when you're the tech that must address the issues 😠.

If anyone has any suggestions or experience with a specific nice, newer printer, I would greatly appreciate them. I'm leaning toward Xerox at the moment.

Thanks in advance,

John