Best Amp for $300 to Power Paradigm Monitor 9s

I'm looking for a 2-channel amplifier to power my Paradigm Monitor 9 (series 7) speakers. I want something simple, with few bells and whistles, but excellent sound. I've read that the Paradigms are bright and so a warm amp would be the way to, and have heard that Marantz pairs well, but am open to any quality option.

My budget is about 300 dollars, and I'd like something in the 100 WPC range, so I will likely buy second hand vintage.