12-1/2" arm. NewArtVinyl Black Bird. Yea or Nay?

If you like that Russian arm then you can look for Infinity Black Widow or much better Luxman TA-1 tonearm (made by Micro) with removable armtube, both under $700 max.   

Living in Russia i have never heard about this tonearm, but i know for sure that nothing is made here nowadays except for weapons, you'd better look for vintage made in Japan tonearms or something new made in Europe, especially in Germany (like Thomas Schick is $1.2k is not too expensive for you). Lithuanian made Reed are terrific tonearms!   

Here is Luxman TA-1 as an alternative to Black Widow (designed for super high compliance cartridges), as far as i know the problem with BW is fragile thin armtube. The Luxman is made of metal, comes with superheavy stabilizer, you can compare it on this image to UA-7082 on my TT.

Luxman tonearm was made by Micro Seiki
I also remember inexpensive Micro Seiki MA-707

Haven’t seen any long arm for high compliance cartridges, to keep the mass as low as possible (and still rigid) designers normally using a 9.5 size.

There was a nice Audio Craft tonearms back in the 70’s/80s with removable arm tubes, there was a light mass tube for high compliance cartridges as far as i know (it was straight).

Audio Craft AC-3300 and long AC-4400 (both are very expensive)

the earlier cheaper version is AC3000 ltd unipivot

Maybe when I am 75, I’ll get one!

https://www.artisanfidelity.com/tonearms/ikeda-it-407

Yes!
I’m not even 45, but it was impossible to resist.
Very rare in matte finish , not CR version (i don’t like the mirror finishing, to be honest).