here's a link to a lightroom plugin that creates a whole series of jpegs for comparison at various quality settings, so you can decide what to use for various purposes. plus he has a few other interesting plugins. it's donationware via paypal, amount is strictly up to you. i have a couple of his plugins, they downloaded and installed pretty easily. worth a look http://regex.info/blog/lightroom-goodies/export-quality-tester
