What cartridge performs best with Thorens TD160?


I have an old Thorens TD160 currently outfitted with a Grado Prestige Blue. What cartridge under $400 would provide a significant sonic improvement to my set-up?
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Thanks so much for your responses. At first, I thought I would just go with the Grado Gold because I am familiar with the sound of the Blue. In your opinion does the AT150MLX outperform the Grado Gold?
I'd go for the Grado gold,not only is the price right it is a great sounding cartridge after you get a few hours on it.
the at150 mlx is one of the finest mm's....plays as refined as cartridges that are much more expensive