The rhythmik and the AD12-300 from BKELEC in the U.K.
I ruled out an NHT 1259, simply too old, want to go with new.
The problem with the RHYTHMIK is that they are NOT selling the driver separately. They want you to buy the whole sub. It even states that on their website. So I wrote them to see if they will sell one separately. Waiting to hear back.
The problem with the BKELEX is that I had written them in the past, got no response. Gave it one more try last week, they actually responded, but have not sent me an invoice. Still waiting on that too!
Might need a 3rd option after all the hassle!