Yes, the 155LC is a better stylus replacement but you have to pay around 180.00 from an AT original one.
Maybe for the main Jazzman463 audio system ( that I know nothing about other that because is the main one seems to me must be better one. ) could make sense but in this secondary system maybe self system limitations preclude shows its best.
The Spica's were good small speakers with not a wider bandwindth: a -3 db at 60hz and 17khz and the Marantz well with that Marantz signature that always shows more on it self that from what is surrounded, this post say something about:
+++++ " This amp sounds fantastic conservatively rated @ 30WPC, it will absolutely impress, very warm classic Marantz sound. " +++++
Anyway, Jazzman463 call.
R.