Is there a good web app that (privately) stores all your prodyct ideas and helps you manage them?

I use evernote currently but its messy. Is there a specific product for this? Ideal features would be: - Super slick UI thats easy on the eyes - Ability to rank ideas yourself - Ability to categorise and/or tag ideas - Some kind of brainstorming esque feature to do deeper dives on ideas would be awesome - Some kind of repository so you could store "stuff" (links, files etc) against ideas would be awesome. Any ideas?