First, let me say upfront that am partial to the Spacedeck, having owned two different ones. Further, it is my opinion after having compared the two, that the original Spacedeck with the original platter is superior to the newer version with the thicker platter. I find that the original is much more lively and spacious (testing both with the same arm and cartridge).
With respect to the units mentioned. I have not tried the Walker with the Spacedeck, though the Walker is a very fine unit and I have heard it used with great success on other tables. I have, however, tried the NA and SDS units with my Spacedeck and with my friend's Spacedeck with thicker platter. Neither of us could tell ANY audible difference when used with my table. The NA unit DID improve the timing and "space" (if you'll excuse the term) on his thicker platter. The SDS was so-so in our estimation. In either case, the original Spacedeck bested the thicker platter version (even with the control). Whether the Walker would improve things further, I cannot answer.
Were it me, and I was buying a Spacedeck, I'd opt for the original and eschew the expense of a controller in favor of upgrading something else or buying a hundred or so LP's.
With respect to the units mentioned. I have not tried the Walker with the Spacedeck, though the Walker is a very fine unit and I have heard it used with great success on other tables. I have, however, tried the NA and SDS units with my Spacedeck and with my friend's Spacedeck with thicker platter. Neither of us could tell ANY audible difference when used with my table. The NA unit DID improve the timing and "space" (if you'll excuse the term) on his thicker platter. The SDS was so-so in our estimation. In either case, the original Spacedeck bested the thicker platter version (even with the control). Whether the Walker would improve things further, I cannot answer.
Were it me, and I was buying a Spacedeck, I'd opt for the original and eschew the expense of a controller in favor of upgrading something else or buying a hundred or so LP's.