Best plugin for Attachments (PDF or other) to post?

Hello WPMU support people,
Is there a plugin you recommend to manage PDF and other files attached to posts, ie not inline?
A quick search has turned up Download Attachments but I would like to know if there a WPMU plugin that does this?

Also we are using the Memberships, Pay Per View, and Pay with a Like plugins. Is there a way to have the post display for everyone but the download to require payment and/or membership?

Thanks for your help.

Reda