Sorry I not massively clued up on these but I wanted to put my 2 penth in.
I have a brother MFC 5840CN I bought it from Viking a couple of years ago at least we send and receive tons of faxes everyday, and had know problems with it.
Main feature is it's an all in one copy, print, fax and scan, even though you might already have these else where the office as u might already know it is good to have stand in machines when things go belly up, and it just helps day to day to not be fighting over the same machines.
Even though I am not very good at IT I have the machine attached to a small network which has two pcs on it so we can both print to this Brother as well as the other brother black and white printer we have.
Never chews up, does make noise when run out of paper though but thats no big problem, it takes black ink and 3 other colours but of course u can just select to print mono chrome in the print page if you want.
I buy the ink from Viking when the prices are at the best and stock up.