Recommended a highly resolving cartridge

I think the ART1000x is a very good cartridge.  While it does not have the warmth of the top end Koetsu cartridges, I know two Koetsu fans that also like this cartridge a lot--it is smooth, relaxed sounding (not edgy) while not stinting on dynamics and liveliness.  If I were in the market for a new cartridge, this is the one I would pick. 

I have heard the ART20 in a system I was not familiar with, but, I liked the sound too--very lively yet not overly edgy sounding.   

@fastricky 

for your all tube system I would recommend to try:

- NOS or good AT-24 (25) for Jazz/Classic tracks. These carts have much lower than others inductance, therefore can drive 5..10ft phono cable w/o problems.

- NOS or good AT-ML170/180 for any tunes. Most transparent, fatigue free music enjoyment guaranteed! 

The reason for MM suggestions is a lower than MC track-force, thus longer stylus and vinyl life. 

ART1000x-Merry Xmas.

I haven't heard the "X" version, but know the 1st gen is "the real deal" and runs with the $10K+ players.

Time to go on a discog binge with some period 1st run stampers.

New Year project:

Nemesis RIAA Phono Stage - Tron Electric

It would be fascinating to do a side by side comparison of the ART1000x with the London Decca Reference - two different ways of extracting a signal without passing it along a cantilever.

The Decca London absolutely does have a cantilever, as can be seen in the following diagram from Stereophile.

The article that it came from can be found by performing a web search for 
"Stereophile review of the Decca London Jubilee / Reference phono cartridge, by Martin Colloms"
(First published 1995-06-01, web publication date 2012-06-20}

In the Decca designs, the cantilever is formed from a folded permeable metal sheet so that it can also function as the armature.

Although the cantilever's vertical orientation hides it from view, its mass and the distance that it imposes between the stylus and signal generation coils influences both the tracking ability and sonics of these cartridges.