Good, better, best. VPI Classic 1 accessories and upgrades.

If you're getting the LATEST model, you can't use the SDS.
It's updated with a 600rpm DC motor. If you want to use the SDS the motor is replaced with the 300 rpm AC motor,along with the pulley.

I have the latest model. If I feel like tweaking my table, I will do the mod along with the Phoenix Roadrunner setup.Just as accurate as the VPI for less.

My table is on brass footers(Mapleshade)which rests on a 4" maple slab.

IMO, I would spend as much you can tolerate cart wise.
Also,the table is worthy of being plugged into a phono stage equal to its retail. Mine is the Fosgate tubed.

I think you should spring for the 3d arm first. I purchased one for my Classic 3 and could not be happier.

With the Classic's fixed motor I don't think you really need the SDS.

Fremer's review says the speed is very accurate.

Already mentioned but if you have a newer one with the 600rpm motor you can't use the SDS; it has a simplified version of SDS built in. I measured mine using the platter speed app/AP test record (mildly warped!) and indeed it is very accurate.

I would get the 3D arm first. This is going to make the biggest sonic difference. Unfortunately, it is also the most expensive.

After that I feel the ring/HRX weight is next best. I have them on mine and feel the improve things, especially with not quite flat or very thin pieces of vinyl.

All your inputs are helpful and on the money. After a little more due diligence, I also see that the SDS is likely unnecessary with the new Classic. A fair amount of my record collection is aged nicely (like me!), so the periphery weight seems like a good first step.

The Soundsmith Zephyr looks like a good place to start as a cartridge.

The 3D arm is definitley pricey, but may be worth the price. What are the improvements/differences you hear with it?

I recently sold my extra EdenSound BearPaws, but think that a wall mounted myrtlewood shelf will provide good isolation....

Zephyr is high output so best matched w/moving magnet phono input. If your Klyne expects lower output moving coil cart, could be trouble. Klyne makes great phono stages so I'm sure you'll be happy and be able to hear the subltler changes you're contemplating. Cheers,

Spencer