> please don't mention Papers
Mind if I ask why not? I'm a big fan, though I admit it's a bit niche. It only works well for academic papers, really.
For more general PDF organisation, have you tried Yep? It's been a few years since I've used it, but seemed to work well.
Links: http://www.mekentosj.com/papers/ http://www.ironicsoftware.com/yep/
I can see tons of arguments for going premium, too. Going paperless would push you over 60MB in a heartbeat. People who travel might want offline access. You can also get note versioning. This one's actually cool: they provide PDF search, which is sweet because most PDF searching and organization apps suck (please don't mention Papers).
[Note: I am not an Evernote employee. Just someone who's used it since 2009 for everything.]