Ambika purchase advice

Thinking of purchasing an Ambika. I see there are different filters/boards etc. Is there anything I should be looking out for to get the best I can? Any questions
I should be asking a seller?

Thanks!
C

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Same here. The more I look into Ambika the more I get confused. I am no circuit expert, I am looking for a great synth to play but can’t pull the trigger because I see there are a lot of options