I'm building a photo gallery website where people are going to be paying a fee to list their photos on the website. NextenGallery looks like the best way to manage the photos, but I'm not sure what the best way to handle the submission process would be. The fee to upload files will vary based on how many photos they're submitting. It looks like nggallery has the ability to tie in paypal for selling photos, but how about uploading? Another forum topic suggested Gravity Forms, but $200 is kinda high.