Upgrade Opinions, Thorens vs VPI


I'm looking to possibly upgrade to a better turntable.

My current setup is a Thorens TD166 MKII with the original tp11 tonearm. The table has a few mods including a solid cherry plinth and birch bottom with sorbothane feet. It also came with the 10mm spindle bearing, same one used on the TD160.

Amp: Rogue audio Sphinx 
Preamp: MM preamp built into the Sphinx
Cartidge: Shure M97xe with SAS stylus
Speakers: Monitor Audio Silver 8

The components listed above are my recent upgrades. I now think my table is due for an upgrade. 

I am considering installing a Jelco SA750D tonearm on my Thorens, since the tonearm is likely the weakest performing part of the table, or going with a completely new table.

I am considering the following tables:

Rega Planar 3 (possibly not a big leap?)

Rega RP8

VPI Classic 1 

Acoustic Signature Wow XL with Rega arm.

I am leaning toward the VPI, partly because I really like its look, but I do want the best sounding table under $3000 (subjective I know). Overall, I'm pleased with the current sound from my Thorens, so maybe the best bang for my buck would be a new tonearm. Some members have claimed that a Debut Carbon will blow the doors of a TD166, but in my personal experience, it's the opposite. So I'm thinking I'd probably need to spend over 1K for a real sonic upgrade over my Thorens.

Anyone have experience with VPI tables versus Thorens TD16X series? Any advice is welcome.
helomech
I have the latest Classic I. If you decide on the VPI, consider the OLDER version, which has the ability to hook up the SDS/Phoenix speed controller. Older models have the motors in the front of plinth. A mod by VPI is necessary for a newer model. I imagine just disconnecting the circuitry and a pulley?

Recent models have have a DC supply for circuitry that is a mini regen AC system powering the motor. This helps the motor get a steady voltage,but not PERFECT 33.3.If you want perfect 33.3 RPM, the SDS or Phoenix is needed.



TableJockey,

Thanks for the tip. I was unaware of the variations. I have a Music Hall Cruise control which allegedly is compatible with some VPI models. It works well with my Thorens. How do you like the sound of the Classic?
Helmech,

relative to to the cost of my other components/speakers2-4K retail, I don't believe I would hear a substantial difference in SONICS until I hit next tier of expensive gear:5-10K? 
Just every now and then can you hear VERY slight pitch deviation during CRITICAL listening. Otherwise, The Classic is a keeper. If anything, I would like to tweak it with an outboard motor and speed controller and maybe the 3D arm.
I have mine on brass footers with a 4" maple slab. 
I make this assessment after hearing plenty of uber show/store rigs.

You probably can find the older Classic for a good deal since its been a few years now since its release.
Spend as much as you can tolerate on the phone stage/LOMC.