The PAP2T is the first gen ATA from Linksys. I am (still) *very* happy with it, and with the ability to totally customize it (without needing to customize it).

But it lacks T.38 FAX support, so if you want slightly better odds of a fax machine working, then look for one with that feature. The very similar SP2102 has T.38. There are others, too.

If your internet arrives over DSL, then consider the SpeedTouch 780wl DSL modem / wireless / VoIP unit. It can probably do a really good job of QoS without fuss, since it "knows" about the underlying ATM transport. Plus, it's a *Speedtouch*, which means it can work wonders on an otherwise flaky DSL loop.