I'm not worried about WiFi, but would like an integrated Gigabit switch with at least four LAN sockets. I also want PSTN connection, i.e. the ability to connect the telephone cable in (POTS), and the house phone out - a sort of integrated ATA so I can fallback to using the landline as well as using VoIP. It should also have QoS for the VoIP.
Other features I'd like are VPN/IPSec, Firewall, DoS protection, etc.
Any recommendations?
Any specific device that I should look at?

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http://www.linksys.com
Linksys is a part of CISCO and CISCO is the biggest in the world and has set most of the standards, particularly in the VOIP (Voice Over IP) area. look at their offerings. I think D-link and NETGEAR also are excellent, but I have been doing this for 28 years and I always have had better luck with Cisco and LinkSys products.
You need to naturally confirm the ones you select are of top quality and run perfectly OK just like new.