Thanks, Jack. I normally shoot 14 Bit RGB NEF and convert to ProPhoto RGB for editing (and back to sRGB for online posting), so I typically use the best the camera can produce.
The photojournalism workshop I'm attending requires jpeg only - and you can't edit. If I shoot in Adobe RGB and they post online for any group presentations or reviews, the color could be washed out (which can happen when you upload an RGB file online, unless the program you're using automatically converts it).
Of course, I'll have the NEFs for future editing (after the workshop is done) - so I'll use the wider color space at that point.