Speakers for old 70s Marantz receiver?

I know these receivers have been around a while, so I know somebody out there would be able to recommend me a pair of monitors that match well. Here's the catch though -- I'm looking for something in the $300 range, $500 max. I listen to all kinds of music, metal being the exception. Can anyone help guide me in the right direction please?

Thanks in advance for your thoughts!