Hi,
Thomas Schick's tonearm would be a good choice, but bear in mind that it is heavy, so those cartridges which like a heavy tonearm should be used with it. Thomas is one of the good guys, so I am a bit biased toward his. However, Joseph Esmilla has been experimenting with a heavy brass insert into the wood plinth of old idlers with positive results. The tonearm would be mounted onto the brass. Imagine a pod, but an integrated one, and you have the basic idea. That build method will allow for the use of a wide variety of tonearms without the concern of influence generated by the drive mechanism...just some thoughts.