Rich, I have been using Zenfolio for about 18 months now----You definately want want to upload your shots in the highest res available. Zenfolio and Mpix will do the work after that. When you are logged on to your site and choose to share one of your photos, zenfolio will offer you several size options, so no need to down size of have smaller copies. Also, if you want to order a print, but the print doesn