Best cartridge to reduce hum under $400 USD


I am currently running a Grado platinum reference on a stock Thorens TD150 mkII and Grado phono preamp. I like the the music it produces, but on my new Arcam - Monitor Audio - B&W based system I am noticing the hum a lot more. The hum increases as the cartridges swings towards the center of the platter, so I am assuming the unshielded cartridge is to blame.

With the b&w sub I am also now noticing more rumble, which may also indicate the cartridge is the wrong compliance? If I recall correctly, the tone arm is medium weight, something like 13 grams.

The phono stage has high and low level settings, but not sure it can effectively handle low very output MC.

Any suggestions?

kn
knownothing
Thanks for the input. If I understand this correctly, I don't think I am having ground fault problems, because when the cartridge is swung away from the table (past it's rest), the hum essentially disappears. Thanks all for the cartridge suggestions. I was actually considering the Grado Sonata Statment, but was concerned about the hum on the Platinum Reference. So you are saying the low number of windings on the Statment cartridges reduces hum from the motor? Even with greater need for preamplification? I think the statements are 0.5 mV.
..sounds to me like your getting hum from the turntable itself. Grados are especially sensitive to hum like this. Call Grado for help..they have some things that may help.
The Sonata comes in three versions. I use the Sonata with 1.5 mv output which is known as the Sonata VPI version. Call Grado and they will give you the info on this.
BTW: I forgot to mention, it sounds like you have an arm and cartridge mismatch causing the cartridge to resonate. You can try adding some mass to the arm and see if that corrects the problem.
The Grado cartridges are a moving iron design and have always been notorious for hum problems with turntables/tonearms that have less than ideal shielding of the motor. This has been well documented. I was a Grado dealer for many, many years and know this first hand.

I'm not sure that even reducing the output voltage of the cartridge will work unless you want to shield the motor somehow on your Thorens.

IMHO, I would move to a different cartridge, (or spend the time and money to shield the motor).