I have the 3com Homeconnect. Its a great cam that produces very good images for a webcam. It is also very good in low-light situations. There is even a lens pack for it (wide angle, closeup, tele). Theres a drawback, though... 3com's cam is discontinued.
The primary manufacturer is Vista Imaging found here
http://www.vistaimaging.com/ . The cam is called ViCam. You might be lucky enough to find a distributor that may have some still in stock. Check out the site for details if youre interested. Good luck.