Hi Steve,
With the VPI Classic, I'm going to be looking for an additional arm-wand and likely outfitting it with an Ortofon 2M Mono. I figure that with the many mono LP's I have here (most unplayed by me as of yet) that the 2M Mono will be a good fit for now with the unknown quality/consistency of the vinyl on these older mono's. Though I've cleaned them with my RCM, you never know what kind of unseen uglies might exist in those grooves.
Without a dedicated mono cart (playing them currently with the Dynavector 20X2H), I must say that some of these recordings are indeed quite special. In particular, the Columbia 2-eye mono's and Decca pink label promos have an incredibly low noise floor and silent tracking. The sound stage is pinpoint accurate with depth. Neat listening!.
Currently playing as I type, Columbia 2-eye Gary Graffman - Schumann Carnaval / Symphonic Etudes - ML6378