The best way I've found to read RSS on OSX is to use Mail, assuming you already use Mail to check your email, if you don't then get your act together.
Start by opening Mail.app from the Dock or Finder (in the 'Applications' directory).
Now go ahead and open the preferences by pressing ⌘, (that comma is part of the keystroke). The following window should appear
Click on the RSS tab at the top of the window and change the 'Default RSS Reader' to Mail.app and set the other preferences however you feel is appropriate.
Close the preferences window and open Safari.app. Navigate to a page with an RSS feed and click on the blue RSS button in the location bar
A menu will appear giving you a choice between 'Atom' and 'RSS 2.0'. These are equivalent streams and Mail.app will read either of them; choose whichever you like. ('Atom' is probably a better choice because it is a more robust file format, but that is a discussion for another day.) Once you make your selection Mail.app will generate a sheet like the one below.
Click 'Add' on that sheet and you are done. The feed will appear under the RSS section on the sidebar of Mail.app. Clicking on the arrow sends the entries to your inbox so you can read them as you would your email.