I just had Michelin Defender M/S 2 285/65/R18 116T (XL rating) tires installed on my stock 200, and oh boy is this a treat. The 200 rides like a Cadillac now, and that’s coming from somebody who had Michelin Defender M/S in 275/65/R18 previously on.
Not sure what magic Michelin did, but these new tires absorb most of the small undulations in the road, and they are perfectly balanced with no weird vibrations at high speeds.
I would definitely recommend the 285/65/R18 tire size, but make sure to get the 116T rating for a much more plush ride (assuming you’re not doing a ton of off-roading of courseo, as there are better options than the defenders for that).