Best All-in-One Monochrome Laser (Home Office)

I am in the market for an all-in-one (Print/Copy/Scan/Fax) monochrome laser printer for my home office. I have an old HP LaserJet 3100 which has served me well, but after upgrading everything to Windows 7, the printer appears to have suddenly become obsolete. This printer has performed almost flawlessly for over 12 years and is not being retired through any fault of its own. Hat tip to the old HP 3100.

In any case, I need something that is network-able, that has real duplex capabilities, that can handle 8 1/2 X 14, at least to some degree. It needs to be very reliable and produce very good quality text documents consistently. The availability of high capacity toner cartridges would be a plus, but is not critical. I don't care about color printing and I am not really wanting an inkjet.

Here are a few of the ones I am currently considering:

HP LaserJet Pro M1217nfw
Hp LaserJet Pro M1536dnf
Brother Printer MFC7860DW

There are so many printers out there, even by each manufacturer. It is very hard to compare them. I am still just getting started, so I would really be appreciative of recommendations for other better options if anyone has any to offer.

Or, if anyone has any comments about the printers I listed above, those would be very welcome as well.