Buffalo Technologies WBR-G54, just picked one up from CompUSA for $99+30MIR... run linux and you can download the GPL'd code if you want from their website. Has alot of cool features I haven't seen in most soho routers. I've only had it a week, but has been stable so far, I researched it alot too before purchase and couldn't find any complaints other than the interface is not newbie friendly (which doesn't bother me in the least).
It allows for intrusion detection, emailing warnings out, VPN passthrough, WEP, WPA, Radius support, you can backup the config to a file and save it for archival, basic packet filtering, mac addy filtering, UPNP, and you can even disable NAT if you want and it will comminucate with an external syslog server for logging. I was really suprised by all the options it has, and I've only touched the surface here.
Anyway, just my $.02