Cartridge for VPI Classic 3?

All great cartridges that match the Classic arm. Cartridge choice will depend on personal taste as each cartridge offers a slightly different presentation. I would also add to your list the Dynavector xx2 mk2.

There are quite a few people that like the Sound Smith VPI Zephyr. It was designed for the VPI unipivot arms.

A sleeper cart that some feel provides very good performance is the AT-33PTG (not available through U.S. importers but available on eBay from Asian dealers). The 33EV is also considered a good performer but many feel its performance falls a little short of its line-contact stylus big brother at around the same cost (though it is available through U.S. dealers).

I will second the voting for the VPI Zephyr cartridge. Great seperation and top to bottom balance, very musical, and matches extremely well with the VPI unipivot arms, all for under $1000. Interesting that it also seems to be a lot less sensitive to surface imperfections ( less pops and ticks) than a lot of other carts that I have used. Good Luck!