Current popular drivers for sonosub?

I've had a pair of 6' down firing ported sonosubs for a couple of years now. Each has an eD 19ov.2 and they share a behringer ep2500. Lately I've been considering chopping the tubes in half, buying two more 19ov.2s and another behringer (4000?) and having 4 sealed 3' sonosubs. However it looks like eD is closing and I'm not sure if I want to try to buy two drivers from them or not. So... What other drivers are out right now that will work for this setup? Thanks for any advice!

I'm looking at a couple Fi Q18's. There are many add-on options for them and I'm not sure if I should pay for the upgrades? For over $300 a driver I wish they'd come loaded and ready to go...
If anyone wants to run the numbers for good enclosure/port size options that's be awesome. I'd prefer to use 24" diameter sonotube but could build boxes if really needed.

To clarify, I think I want to go ported because of the increase in volume vs. sealed (if that is even true?)

Thanks. That driver is now on the short list. Of course I have to ask, any idea when the next (HF) version is coming out? If less than 6 months or possibly 1 year, I can wait.

No problem. Thanks for your help.