Thank you both!
Erik, I have owned an Aesthetix Rhea Eclipse Phono Stage used in my main system for 12 years. It is my all-time favorite component. I recently had Aesthetix complete a factory refresh at a very reasonable price. Their customer service is exemplary. I assume the Mimas is of similar quality and reviews have confirmed that.
The reason I am considering Luxman 509z is it has great reviews, the build quality is great, and I love the decibel meters; they are very cool with a modern retro look.
Probably best that I haul my speakers to both Luxman and Aesthetix dealers and do demos. There are dealers in my area and I would like to support them by purchasing from them rather than online.