Thanks for all the info. I haven't done anything with medium compression since I first got my first digital PS (Canon G2 4MP). I freaked out at the quality and never tried again.

I'll shoot around with large/medium and see how much more shots I get and print some samples. I recently bought another 1gb cf on Ebay but I anticipate using that for my second camera (30D for zoom and DREBEL for wide angles). I have smaller CF cards that are too slow for real use.

AV, thanks for reminding me about the AWB. Unfortunately, I'll be shooting indoors and out so I may have to do AWB. I'd hate to forget and switch over and screw everything up.

Thanks again everyone.