Best musical sub around $1k


Looking for some advices on sub.

I am deciding between Sonus Faber Cremona Auditor + sub or go full range and get Cremona. If I were to go with Auditor + sub, I will need to keep the cost down for my decision to make sense, hence the $1k budget. I like the stregth of mini-monitor - imaging, better coherence (2-way vs. 3-way), and easier placement. But Auditor needs to play loud to sound full range and I don't have that option most of the time due to my power amp (BAT VK-75SE) and small kids. So getting the Auditor will require a sub for my need.

So what sub will you recommend? I had a REL Stadium III before, but price is out of my range right now. Cremona sub is also too expensive. Are the smaller REL as good as Stadium III or I am better off getting an older Stadium (II ?)

Or to complicate the issue further, get a floor standing Cremona instead?
semi
Thanks for the reply so far. I have heard good thing about ACI Titan, but the look is rather unconventional. Will need to check out PSB and Boston Acoustic as well.

Not hearing much about smaller REL like Storm or Strata. I have read before Stadium is where the fun begins, is that true and my money is better spend on other sub instead of smaller REL?
Vandersteen 2WQ new at $1400, used about $800.00. But you do have to spring for the fixed filters; try and find aftermarket which are made with higher quality parts than OEM. 3, 8" w40 oz magnets. 300 w onboard amp.
I have a chance to buy a Storm III for a little over $1k, but heard Stadium III is a big step above and I am debating if I should save up more to move to a Stadium instead. Will Stadium III be worth the extra $1k or will I be equally happy with the subs recommended above?

I know Stadium is a fine sub, but at $2k+ used, total price with monitor speakers is pushing very close to floor standing speakers. To me, sub is an accessory that never works well 100% of the time. Sub + monitor will never rival floor standing speakers in integration or coherence, so spending this much money on an accessory is really a tough sell to me.

Did I just answer my own question?
I am also looking into a new sub. The SVS pb2+ is making a big splash right now. I would like to know how it is musical.

Tim