By which I mean that the uploader pays (by subscription plan), the downloader does not.
Please take a close look at pressloft(dot)com as the functionalities on this site are exactly what I'm looking for. I should really be able to do all of that.
At this time I leave the options open about the design, as I would like to hear your opinion on which framework you would suggest to use.
I know it can be made with Wordpress and some plugins, but maybe you'll have another suggestion such as Drupal or others.
It has to be clean, easy to use, quick and fully functional as the site I referred to above.