What about the Zyxel P-660HW? We install the P-66x Zyxels for most of our customers and they tend to be pretty bullet-proof. At a guess, we've installed about 40 Zyxels over the past 18 months and I don't recall a single failure.

The firewall and NAT configuration are pretty intuitive. Here's a link to a German website that hosts some menu emulators (links across the top of the page).

Not sure exactly what wireless security protocols they include, certainly WPA and WPA-2.