Well, the winner is a Dynavector XV-1. I got a chance to hear almst all of the mentioned cartridges (never could track down a ZYX), and though all were very, VERY good, in the end I preferred the tonal balance of Dynavectors. The ultimate nail in the coffin was Raul (many thanks for that Raul) pointing me in the direction of a killer deal on an XV-1. I spent a couple of hours setting the thing up last night, and while I am sure it's not perfect, it is close, and is a marked improvement over the 17DmkII. I did in fact get eveything I wanted - slightly firmer bass, better resolution, and a bit more output. Also, things are a little smoother up top.
In all fairness, I have gained a new appreciation for the abilities of the 17DmkII, it really does an outstanding job for it's price. But I certainly don't regret selling it to upgrade ;-)