I believe JOA are regarded as one of the best homage pieces but i'm not sure whether they're still available.

Frankly, buying the 'best' homage is a falsehood because none will really be like the real deal, other than general aesthetics and approximate weight. The brand haters love to say homages are so similar why buy the real deal? Well self delusion entered the room somewhere, because no homage i know really gets very close for any number of reasons.

If you feel you really want a Panerai, buy the cheapest homage for an approximate experience and then decide if a real one is still for you.