Some don't support HDMI audio because they don't process HDMI. Some don't even work as a pass-through. I'd hardly call "run one cable for video and the other for audio" complex, but it's subjective.
But if you spend more money, you'll get HDMI audio. Given that I don't know what you consider simple (do you want one with autocalibration to make calibration simple, or do you not plan on calibrating because that's complex?), I don't know how to answer.
Marantz has very few buttons.