I was in the same situation ... looking for a great web-cam to talk to my parents. Logitech Quick Cam PRO seems to be the most recommended one (costs anything beween 45 to 99 .. check ebay).
However, I decided not to by it as I discovered that there is no better webcam than your much more expensive digital camcorder. If you have a firewire/usb digital camcorder, you can just use a free utiliy like trackercam .. and you are good to go ...