Well, it really depends on your budget. My first was a VPI. It layed down the cleaning fluid and vacuumed it up. It does a good job, and is relatively inexpensive, but it sounds like a 747 landing, and is quite large. I now own a German Nelly… elegant, effective, quiet, and small, and cost… two or three times the VPI. But there are many on the market. It will depend on your budget. My VPI lasted for twenty years… so it is a long termed investment, worth choosing wisely. Ultrasonic are a mixed bag, more complex.
I would ask Bard (Google AI), given your constraints and then research those on Stereophile and The Absolute Sound. Also, both these mags evaluate lots of classical albums for performance and Sonic’s.. I think they both have done the hundred most important classical albums somewhere. I would research the hundred most important classical recordings online to find the right albums to start with