Matt
+1 to Chris's Microsoft Lifecam HD.
I had to spec up a project for a big pharmaceutical company who wanted to use webcams on their booth at an exhibition. Needless to say, we had to ensure top quality HD images. The Microsoft Lifecam HD came out on top.
Only thing is the software that comes with it is pants, and the built in microphone is adequate but not great.
Not an issue on both points really, as Im doubtful if you would actually use its own software (there are much better web steaming packages out there anyways) and a simple external microphone would give you sound if you needed it.
Hope it helps
