VPI HW-19 Upgrade question SAMA or SDS?


OK, the upgrade bug has bitten again, and I know that ther are a number of folks here that have lots of experience with their HW-19.

I have a VPI HW-19 Mk III that I recently upgraded to a Mk IV with a TNT platter with an inverted bearing. Also, it has a sorbathane puck suspension rather than springs, and I've replaced the rubber feet with cone type spikes. The table dead level sitting on top of a 1-1/2"-inch thick maple top shelf of a very heavy flexi-rack. I'm using an ET-2 arm connected to my shop compressor with four stages of precision air-regulation with the final stage adjustable just before at the entering the ET-2. I just air-up the compressor's 30 gallon tank, then kill the compressor so that it won't start back up, and I can listen for hours (wife think that I've lost my mind every time that I do this, but that's another story). Also, I'm currently listening to an AT33PTG that I have come to really like. The phono section is a Threshold SL-10 upgraded with Black Gates throughout.

The Mk IV upgrade made a real difference from the Mk III. As I quickly found out, the Mk IV presents a fuller soundstage and better base than the Mk III platter/bearing. I view that upgrade as well worth the money, especially buying it used here on A'gon.

Here is my dilemma with funds being limited to purchase only one or the other at this time, but not both - at least for now.

What do you think would be the best upgrade for this HW-19? A new SAMA for $400, or a used SDS for $600 to $800? Used SAMAs never seem to come up for sale, but you can always find a used SDS on Audiogon. I think that there are at least three available for sale here as I write this.

Also, if someone thinks neither mentioned upgrade would be cost effective, and that money would be better spent with an upgrade elsewhere, please say so. I'm trying to keep my mind and ears open - for better sound!

Thank you!
forrestc
I have a TNT that I have taken along the upgrade path. I have found the SDS to be preferred prior to upgrading the SAMA.
For my use with my HW 19 MK IV I have found that the SDS offers more flexability than the SAMA. I took the SDS out of the system for awhile and found that the overall sonic presentation was not at a level with the SDS in the system. The SDS makes a decided improvement in overall sonic signature and will remain in the system. The only reason to use the SDS with the HW 19 series is to remove the motor from the chassis and eliminate vibration from the motor to the chassis. The SDS approach is different in that it reduces to a vanishing point the motor vibration from 115 Volts down to 72 Volts. Plus it adds the abilty to switch from 33 to 45 rpm, without manually changing drive belt from one groove to another. While somewhat pricey the SDS is a very highly recommended component, that will enhance the playback of any VPI turntable. If analog is your bag, then this is a must have.
Thanks Ferrari. Right now the SDS is out of the question unless I can build one.
btw which SDS? I assume the newer version is nicer, but will you get the same results for the older and much cheaper version.Recession think has taken hold of my brain and my wallet.
However, this has led me down a DIY road that has been more enjoyable than any of the purchases I have made in the past.

Analog is definitely my bag.

e
I am using the current SDS unit. Years ago I used the first generation SDS with great results, not quite as good as todays current offering, but well worth the search.
Get an SDS, then you can switch over to a string drive (silk thread) and further improve the PRAT and musicality of the system.