Laser MFP AIO - Canon MF5770, MF8170c, HP Laserjet 2840, or Brother MFC8440DN?

Want a reliable AIO for a small office (6-8 employees). Must have good paper feed for manual copies, and good ADF. Hate paper jams with passion. Cost not terribly important, but wanted to keep it under $1000. Reviews on Cnet/Zdnet don’t mention much about reliability or paper-handling issues. I’m hoping people who use these products in the office can tell me about basic reliability

Canon MF5770 - Monochrome Laser. About $400

+ADF for faxing/printing very good
-Manual Feeding sucks/jams a lot (we use it very often unfortunately)
-Somewhat flimsy tray

Canon MF8170C - Color Laser. About $800.

Presumably about the same as the MF5770. Hoping for higher quality/ fewer jams since it’s double the price.

Xerox Workcentre 2424c. Color phaser.
+Uses solid crayons it melts for color yay!
-About $1800
+Duplex scan/fax/print. Hopefully nice quality.
-About $1800 I probably just want to buy because it will be a fun toy.

Brother MFC-8440N. I have one of these. Brother MFC-8440DN adds duplexer.

+The drivers are great, network faxing/scanning is great. Very fast.
+ADF seems good
-Manual feeding SUCKS. Manual bypass tray horrible.
-Toner cost on the high side.

HP 3330mfp - Had two of these. Sick and tired of HP as well because of jam issues on the ADF.
-ADF jams a lot. Replaced it for close to $200
-Scanning/faxing very slow.
+Toner cheap, long lasting cartridges. ($80 lasts like 20,000 copies)

Thank you for any help in advance.

EDIT: Gave up and ordered Xerox m20i. First paper jam I get will start swearing and bomb Xerox.