I doubt anyone but Korg will be seriously competing with Behringer for any poly analogue. I kinda regret a tiny little bit not buying a Prologue8 at NZ$1770 on sale recently - I noticed they went back up to $2200 not long after. But I still don't really need a big poly.
I don't think I have enough long, frizzy permed hair and spandex leopard print pants to play an Oberheim.