The high output MC's I've seen have an output of around 1.6mV.Alot of phono pre's like to see at least 2.5mV which puts the high output MC's in a less than prefered range.You will need a preamp thats up to the task of providing enough gain.
Why a low output M.C. rather than a high output?
Since many cartridge manufacturers make both High and Low output models why would someone prefer the low output which very well could require a step up transformer along with another set of cables? Wouldn't resolution be less this way with the extra step?