Seeking advice on possible VPI turntable upgrade

Hello All,

Please forgive the length of this post; I hope you bear with me and read through.

Looking for advice from experienced VPI users please. I have a Scoutmaster that was my late father’s turntable. I have made numerous modifications and upgrades to it (please see below) and use it in my main system. I now have the opportunity to purchase a VPI TNT-HRX (with stick 12” arm) from an acquaintance. I had been considering saving up for the Direct Drive or other “uber table.” If I get another table, the Scoutmaster would love to my secondary rig, which still is good and gets a decent amount of use.

I do love the the sound of my modified Scoutmaster, and it’s addictive—a joy to use. I have to force myself to stop listening in the evenings so I can get some sleep!

Here are the modifications I’ve made:

1) 2” thick Terrastone platform from EdenSound for table

2. Separate Terrastone platform for motor

3. Large Terracone footers for turntable

4. Brass damping weights for chassis and motor

5. Upgrades capacitor for motor

6. ADS and SDS motor controllers

7. Stillpoints LPI record weight

8. VPI periphery ring clamp

9. 2 custom metal VPI 9” tonearms (“Classic type”) and one 9” 3D arm in addition to stock JMW9 arm, all with different cartridges (Proteus, Paua, Purpleheart, Zephyr Mk II)

10. Transparent Reference MM2 phono cables

11. Herron VTPH2A and Musical Fidelity NuVista Vinyl phono stages.

So, after  doing some reading and research, it seems that the options are: 

1)  do nothing now and  save my money for an uber table 
2)  buy the TNTHRX table now; I would need to buy a new platform for its larger footprint; then probably upgrade the arm to a 3-D or Fatboy  arm
3)  buy the dual motor fly wheel assembly for my scoutmaster now, and then possibly still get an uber table at some later point. 

 All constructive advice is welcome. My apologies again for the lengthy post and thanks in advance. 
I own a VPI Super Prime Scout sold by upscale audio. I have two arms, aluminum with a Ortofon Cadenzo Mono & JMW 3D with a Ortofon 2m Black. Very easy to set up and plays like a dream!

Nice! I’ll bet that ‘table sounds great. And I do appreciate your perspective on the advantages of a piece that one knows so well and has put a lot of time and effort into. It’s sounding pretty sweet as I write this....

would you mind elaborating on your experience with the switch to HRX please?

Sure. The VPI HRX presented a more natural with richer, but more detailed, sound. The textures of music were more apparent, the scale of complex music was reproduced with greater ease and detail. I can think of no area where the HRX did not beat the Superscoutmaster. The HRX was like a 911--a complete presentation-- whereas the Superscoutmaster, a Boxster, tries its best to keep up with the nimble handling and punchy response.
 I think the HRX is a steal at used prices. In fact, it is the only component in my system which has had no upgrades (other than 2 additional arms and additional carts) since I purchased it about 12 years ago. Contrast that with at least 3 new preamps, 3 new amps, 4 new power conditioners, 3 pairs of speakers, 3 audio racks and 4 cd players in the same timeframe.  And I have no plans to upgrade. Also note--your current turntable as constituted is quite good. I agree that the LP1 is a great upgrade from the VPI record weight. May I ask what cartridges you use? 
Thanks gpgr4blu for your detailed response. I have 4 tonearms with the following cartridges: Transfiguration Proteus, Soundsmith Paua, Kiseki Purpleheart, and Soundsmith Zephyr Mk II. What’s the rest of your system, and what cartridges are you using? Thanks!