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I'll second Dennis here - UNcompressed RAW is the only way to go! The best quality and quality control will be achieved through NEFs. JPG is suceptable to WB mistakes and has very little latitude for exposure correction should you make a mistake. TIF is a waste of card space IMO.
Before I shot my first wedding with my D100, I took lots of pictures of the same subjects using Raw, Tiff and jpeg fine. The results were such that after blowing the picture up to a size far greater than 10x8 no differences could be noticed by me. I then simulated a wedding using the 3 formats and believe me, if you shoot with raw or tiff you are going to end up in a situation where the camera is frozen whils't writing to the card. This would be very embarrasing. I used jpeg fine and have sold as many re-prints as I ever did with film. (all 10x8) One thing though, as it is relatively new to me, I did alter the levels on photoshop on many pictures. (usually auto levels was enough). Hope this helps, Mal
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If you feel confident in your ability to get the exposure right the first time, JPEG should be fine. Many pros use JPEG workflows because they cannot afford the reduced productivity of a RAW workflow.
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And a newbie amateur D100 user at that, so perhaps the pros can give better advice. I would THINK you could "get away" with using "Large-Fine" JPEG and either using "Normal" or "Auto" on the sharpening settings. As most have noted, the D100 is very conservative (intentionally) on in-camera sharpening of JPEGs since it's more difficult to "undo" sharpening once it's been done to the original image. It has a more "Film-like" quality to it versus the blown-out, over sharpened images that come out of P&S consumer cams like the Sony 707.
I just had some 8x10s printed from jpg fine files and they are excellent. Hard to tell they weren't from film. I would shoot the reception jpg fine without any worries at all. Probably are not going to sell many 8x10s from it anyway.
