Brangwen,
This guy is good, I've dealt with him online and in person. Has some good "just add drives and ram" systems done on ECS/PCChips mobos, and also has some good used stuff right now:
Unicom PC
BTW, I'm running one of these jobs, and XP1800 system running UD 24/7 for months now with no problems. Audio, video, LAN and modem are all integrated.