Thanks Bob, yes Needle Doctor price tweaked my interest. Jjorqueram's assessment of X-1 sounds like it isn't going to provide significant improvement from Grado Blue I am currently using, which is reasonably detailed but lacking magic with this arm and table. Suggestion of Dynavector 10X looks like a good one - but almost 5 times X-1 current price - I guess that is why it is actually called the 10X5 :-)
Ortofon X1-MC
Does anybody have experience with this cartridge? I am thinking of trying one on my Thorens 150TD with an unmodified TP 13A tonearm. Compliance and weight matches well on paper.