Jax: Perhaps one of the new Sonicwall TZ series that have just come out - TZ300 would be minimum & supports up to 10 Site to site.
http://www.sonicwall.com/us/en/products/TZ-Series.html#tab=models

You mention going to UFB, so you don't want to cheap out on a gateway device that could potentially be a bottleneck for 100Mb+ connections esp if you enable UTM features - check the throughput specs.

If on VDSL, you might need to bridge the connection to get the public IP on the firewall, I think the Draytek V130 does this.