Unlike Jeffreybowman2k, I never got the best out of the Music Maker III (I just sold it last week). I haven't had much success with Grado's either, just sold one of those too!
If you like the presentation of the Shure V15-series, they can be nice. Not everyone's piece of cake, but the Shure sounds incredibly neutral, but perhaps lacking the sweetness of many other carts. I have an extra armwand with a Shure in it, for certain records.
Overall, I'm very fond of the sound of the Shelter 901 with mine. The VPI table tends to sound a bit soft, so the extra zip that the 901 offers is a good match with the table (thanks to Jay at Audio Revolution for pointing this out to me).
Hope this helps!