High output MC cartridges

The Zephyr was in your price range. The Grado is not humming because of your system. It is humming because it does not like your turntable. Get one with a DC motor or far outboard motor. I have zero experience with Soundsmith cartridges but plenty with Grado's. The Ref 2 is a noticeably better cartridge than the Ortofon 2M Black to which I have compared it. It is also twice the price. I have not compared it to other MM cartridges. 
Horny guy, get another Grace F9 and save yourself the indigestion. My ability comes from a great education, a questioning mind and experience.
It bothers me that you do not understand the relationship of mass to inertia. Are our high schools really failing our kids that badly?

chakster is absolutely right. High Output MCs have to have a large coil structure to produce the output leading to a high mass situation. Not good for something that has to move very fast. A good moving iron cartridge has perhaps the lowest moving mass of all resulting in instant transient response. Get a Grado Ref 2 or a Soundsmith Zephyr 2. If you have the urge to go MC then get yourself a little tube phonostage and do it right.