Consider an alternative?
Kevin - I know this isn't exactly what you're looking for - and I apologize in advance . . . . . . BUT, in my experience the weak point of most multi-function printers (MFPs) is the scanner. Yes, it works, but is usually pretty slow and often lacks automatic double sided scanning, unless of course you're willing to spend much more money on the front end.
Perhaps you could consider:
1). Stand alone scanner: I recommend the Fujitsu S1500. It's very quick, scans both sides in a single pass, and has connectors to various other services including Evernote, DropBox, etc. I've been using Fujitsu scanner products for several years now and they are almost the singular reason that I've been able to move to a paperless (well, almost) existence.
2). Wireless laser printer: color if you need it, but frankly inkjet color printers do a better job of color rendition, so monochrome laser is fine for most use. Initial cost is much lower than MFP, replacement cartridges aren't too bad and they last a long, long time. I tend to stay with Brother or HP for these.
3). Use a fax to email/email to fax service: depending on your volume this can range from $0.00 (ad supported usually) to ~$100 per year. Many good providers available - I use www.myfax.com but there's a lot of good ones.
As I said, I know I didn't really answer your question, but just trying to fuel some alternative thoughts . . . .