Dear Steve: There are many alternatives: Basis, SME, Acoustic Signature, Avid, Verdier, Simon Yorke, Pluto, Transrotor, Sota, VPI, etc..... But this is not important, the important issue is: What are you looking for ? only a TT that last for ever? or a better analog sound reproduction. If you are looking for the last then you have anothers choices: a better phono cartridge that matched well with your SME tonearm, a better phono stage preamp and/or a better amplifier, etc.....
If you really like the music and want to know how it sounds what is recorded in your 9,000 LP's, you have to change your electronics, specially your amplifier: this amplifier, like all tube amplifiers, is a nice an expensive equalizer let me to explain it:
many people, like us, love music and through our analog system we want to reproduce what is in the recording ( there are many people that does not care about it ), that is that we need a system that can do that job: that can be ACCURATE TO THE RECORDING. The tube amplifiers can't do it, it is impossible by the physics laws), only can function like an equalizer sound reproducer. All the tube amplifiers change their frecuency response with the changes in the impedance of the speakers and this speaker impedance ( normally ) change with the frecuencies, so what are we hearing through a tube amplifier?: a hard make-up sound, a " clown " sound, not what is it on the recording. I think that almost all of us have a duty: take care for that the signal sound reproduction be the less degraded signal in our system.
So, if we want to hear what is in the recording first we need an accurate audio system and the electronics ( like the amplifier ) are a very important step to get that target. Now, if your target is other than to hear what is in the recording then you can do anything you want.
Regards and always enjoy the music.
Raul.