Dear Nrchy: +++++ " how much would I be loosing to the TriPlaner? " +++++
Your question could be too: " how much would I loosing to the SME V ? "
The Triplanar is a very good tonearm but the SME V is an excellent tonearm.
From today tonearms I don't know any tonearm that really " hands down " the V ( all these is relative because many things depend on the other analog items: cartridge, TT, etc... ). It's design take in count almost any parameter for the " perfect tonearm ".
The SME V ( btw, all SME products ) is not only a " tonearm " it is really a high tech instrument named: tonearm, the building level quality is unmatched in the industry and its performance is first rate by any audio standards.
Now, if you mated with the Sumiko Celebration you could have a " awesome " combo for the music repoduction.
For do the Celebration " voicing " the designer cartridge did use the SME V. So, that combination is really a great one and will work beautiful on the Cosmos. No, the ZYX is not a " contender " against that combination.
Regards and enjoy the music.
Raul.