Speakers For Fisher 500C

I'm picking up an oldie but goodie -- a Fisher 500C receiver, circa 1966.

I'm thinking this 37 wpc sweetie will not be up to the task of driving my Martin-Logan Sequel IIs, although I'm going to try. Maybe biamp and use the Fisher on top?

If I set up the Fisher as a second system, what speakers should I consider? I know an easy load, but sonically what would be a nice pairing with the 500C?