I'm so jealous of your D200 Sam! Yes, you can view the photos on your camera in RAW mode - don't waste your card space on the JPEGs! I also have changing lighting conditions during my photo shoots. Here's my workflow: When photographing, I use my WhiBal card for whitebalance (just take a photo of the card in the lighting situation the subject is in using RAW mode). When I change lighting conditions I take another photo of the card (I wear it on a lanyard).
When I open the photos in Bridge, I select all the photos in that light environment plus my WhiBal picture and correct for the white balance (shift and click on the card in the preview and it changes all the photos I have selected). Then I select only the photos that have a similar exposure and correct the exposure/brightness/contrast. I can workflow 150+ pictures in 5 minutes this way. Then with bridge I go through my photos and label my favorites with a color - those are the ones I will edit and save as JPEGs (might start using TIFF) as my final step. Seriously, this has saved me T-O-N-S of time! It's so great - and I was slow to convert to RAW too because I was overwhelmed by it. But once you use it two or three times you realize how easy it is.
My last step is running my unsharp mask/noiseware action on them. Then I can do my artsy fartsy editing if I think the photo calls for it.
Check out this site for a video tutorial on the WhiBal that will show you how to use Bridge too.
http://www.rawworkflow.com/products/whibal/index.html
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Camera: Nikon D300
Lenses: 50 1.4, 85 1.8, 18-200 VR, 75-300
Software: Photoshop CS5, Lightroom 3