How to choose a cartridge you can't hear on your system?

My personal cartridge history has gone from a humble Goldring to a decent Benz H2 and finally a Dynavector XV-1s.  Recently my 3 year old decided to break the needle on both my Dynavector and Benz (two arm setup).  This tragedy prompted a me to send my Dynavector out for re-tipping and the purchase of a new cartridge to sustain me through the expected rebuild period.  I bought a decent Sumiko Evo III.  

All of this is to come around to a realization.  In many ways, each cartridge brings something new to the table.  The Evo II had more solidity or weight to the sonic presentation than the others.  The Benz had a seductive warmth and the Dynavector a detailed nuance I most enjoyed.  I don't think it is possible to know ahead of hearing a cartridge in ones own system which brands house sound one prefers.  

I find cartridges to be the hardest audio component to buy.  How do you choose?