The logitech c920 is a good webcam for that, it has a decent dynamic range.
Also has a built in h.264 encoder so the CPU usage is much lower as compared to the c910
here is a pic of my desk, the room lighting is a single 75 watt equivlent light
The exposure adjusted to the screens
If I was to use manual exposure and tweak everything just right, I could get the room a little brighter while still keeping screen detail.