I'm not sure that the D100 can set the WB in Kelvin (K on the D2H), but after my classes with Ron Reznick, that's what I use. I sometimes (often??) don't get it perfect, but if you are shooting RAW, then you can correct it with no loss of data in Capture.
I think you said that you have been experimenting with shooting RAW, right? If not, I highly recommend it. It gives you so much more flexibility.