I run my only little home network with my own VoIP service via 2Talk. My ADSL wasn't great and when they dug up my street for UFB I jumped at the chance to switch to something faster. However, I wasn't keen on a Fritz box - very expensive and it would provide what I already had (ATA functionality, switch, wireless etc) while at the same time taking away what I was already enjoying - Open VPN and Asterisk!
I asked the nice people at Snap whether it was possible to use their UFB service without the Fritz box and was told that it was usual but it wasn't against the rules - as long as I could do PPPoE and vLAN tagging then it would likely work.... I already did PPPoE to the ADSL modem and a quick ferret turned up the right place to apply vLAN tags so it didn't seem like it would be too taxing. I figured I'd have a go and see if I could save myself the cost (and pain) of a Fritzbox.
So...I went ahead and I'm happy to report it worked really well - once the fibre connection was in I unplugged the ADSL modem, plugged in the Chorus box, set the vLAN tagging and re-applied the PPPoE settings. Two minutes later I was up and running with no hassles and a much better connection.
For those interested I use a small PCEngines Alix device (http://pcengines.ch/alix2d13.htm) with 4GB Compact Flash card. I bought two of these (one for router/firewall and one for Asterisk), and including the compact flash cards, cases, power supplied and postage from Switzerland they set me back USD315.
I run pfsense on one of them (http://www.pfsense.org/) which has a build that works with the Alix series, and on the other I run Astlinux which has a specific build for the Alix PC. All up it has cost me less than the Fritzbox and in exchange I get full control over everything. It's obviously not something I'd recommend to newbies but for anyone with a geeky streak it's well worth having a go!