Tonearm comparison, Rega vs Zeta, anyone?


Rega RB300 (giant killer) $250 - $400, - - - Zeta tonearm (Giant) $1350 NOS. sold for $800 on US audiomart.

I’m stepping up a level in the cartridge dept, and wonder if the benefits of doing so might be further augmented by stepping up a level in the tonearm dept, and if doing both would make a sonic improvement greater than the sum of it’s parts?

A gain of that level in sonics would make such an expediture intriguing, Eg: 1+1= 3.5. (ajusted to compensate for the law of diminishing returns).

Has anyone out there used "both" an RB300 and a Zeta? And would you feel that moving to a Zeta is closer to a lateral move, or more reflective to an exponential improvement?
My Rega has been rewired with Discovery interconnects, and uses the heavier counterweight.

(Cartridge move is from a Grado Reference Sonata 1, to a Dynavector 20x2 High Output).

thehorn
If you try it and like it, and wish for just a hair more air, tightness, and speed..if you have the original acrylic arm board, switch to an aluminum or metal armboard.
if you still have the acrylic arm board go buy an aluminum one from oracle they are a huge step up and look way better too. and reasonably priced, get a service kit while your at it if it has not been done already.
Why look only at ZETA? There are other vintage tonearms out there that are available for reasonable amount besides those mentioned above. E.g. Micro Seiki MA505, FR64s, Acos Lustre GST 801.
In addition to the arms driveman listed above, the Victor 7045 is also a great arm. They can be had pretty cheap on ebay. 
I'm not a big analog guy, but have a decent TT setup. A friend of mine has a very nice (and properly setup) Basis TT. with a Rega arm and Lyra Delos cart. One of the best TT setups I have heard! IMO