I agree with what @lewm says. I have an Grace F9e with the original stylus and the Soundsmith Ruby upgraded stylus, also an original F9e Ruby. The Soundsmith stylus is the better of the 3. I also have a Soundsmith Carmen II and the F9e/Soundsmith cartridge outperforms that one as well.
If you want to stick your neck out there a bit, a friend of mine just bought a mint B&O MMC-1 with the Soundsmith adapter, and I own the MMC-2. These cartridges stack up quite well against MC cartridges and work well with low mass arms.