I can't make a choice:

Alesis - Andromeda A6
Studio Electronics - Omega 8
Jomox - Sunsyn

What are the pros and cons?

cons - expensive .
Why not look into a KORG MS-2000 ? Or a Novation K-STATION . It may be analog modeling but you usually get more features . As for authentic analog sound , it's all completely electronic so that shouldn't matter .

Well I think I go for the Omega 8 because you can add ARP and 303 filters.

I don't want analog modelling!