What's your budget? Do you plan to use it for anything other than listening to records?
Traditionally (now vintage) receivers all had phono inputs with built-in pre-amps. Today only a few receivers have this feature. Because of that many turntables made today, especially those made for the consumer market, have a built-in pre-amp that you can turn on or off. This (with the pre-amp turned on) allows you to connect the turntable to a receiver or amp by way of a "regular" RCA input (e.g. one marked "CD" or "auxiliary").
If your turntable has the built-in preamp, it should work with the Magni and your cans. However, I have not personally tried it and issue no guarantees.