Marco1,
I don't know either, that's the point. I have a Virtuoso V1 (among others) and I've used numerous AT styli. It's a pretty nice cart.
Many people raved about the V2 Maestro with increased output. Most sellers say it's 4.2mV ?
There are numerous HO carts you can get for $1200 including Maestro, Decca, Soundsmith, Grado, Ortofon, Sumiko, AT and I'm sure three's more. If you can use a LO, there's many more. There are also vintage carts, but sometimes finding a stylus is a problem.
I don't know the mass of your arm or your system/taste. Maybe someone will chime in with recommendations, I'm a little reluctant.
Regards,