Zyxel 652hw

Hi - a customer of mine is currently using a Zyxel 652hw which I believe is an ADSL modem, router, switch all in one going by this quote I found online.

"Prestige 652HW integrates the functions of ADSL router, powerful firewall, Virtual Private Network (VPN), Wireless Local Area Network (WLAN), and a 4-port switch into a single enclosure".

The point is it is playing up and I wondered if anyone could recommend a suitable replacement that does all of the above? Much appreciated.

Andrew