@rauliruegas , I prefer arms that are lighter. With lower compliance cartridges you can always add mass. It is much harder to take it away. I never use very low compliance cartridges because they will increase record and stylus wear and generally do not track as well. I go with medium to high compliance cartridges. There are very few ultra high compliance cartridge's available now. Not sure why. Maybe you know. Perhaps it is because nobody makes the ultra light arms they require any more.
Remember, I own Sound Labs speakers and have been dealing with ESLs since 1978. The X350 will work, probably better than most but the high impedance at low frequencies will stifle it and choke the visceral component important to good bass. With ESLs you have to consider the amp as a component of the speaker. Generally amps with very large power supplies and ultra low impedance output sections will work better. They also have to have very good cooling because of the very low impedance at high frequencies demands high current which produces a lot of heat. The X350 is fine in that regard. Upgrading everything else is important but only applies to records. Improving the amplifier match will make a significant improvement with any source.
@sheridanmartinj , next trade in the X350 for an XA200.8 and you will make an even larger jump in performance. Do not let the power specs fool you. The XA200.8 is a more powerful amp.
@shinemaster , you forgot Zenith!
@limomangus , it seems you are a music lover but not an audiophile. Perhaps you are on the wrong site. The vast majority of us can not throw unlimited money at our systems. The trick is making the best system we can afford. Discussion is useful in that regard as well as a lot of research.