Let me toss the Asus A7N266-VM/AA onto the pile too. It's older technology but I've had good results with the ones at work. We've got about 30 of them now, and I think we'll probably even use them for next fiscal years' builds (with 2400+'s). Their stability is exemplary and the performance seems pretty good for IDE-equipped systems (SCSI for me, thank you).
Their weak point in my mind is mainly that the onboard video is not super-crisp at higher resolutions. Add a low-end AthlonXP, 256MB of Crucial PC2100, and Windows2000 Pro, and you're all set for typical office uses. I usually set the systems up to use 8MB or 16MB of the system memory for video, although it can be set to 32MB if you're planning to play some UT2003 Demo after hours or something (yes, it can handle it if you don't get greedy with the eye candy and resolution 🙂).
Oh, and I build ours with Antec Plus660AMG cases, with the TruePower330 power supplies. I'm sure the TP330 seems like overkill, but we want a five-year lifespan out of these systems and I wanted to get the "towing package," if you understand what I mean.