I do like fine things :D, but I mainly listed those, because I think they are probably very good subs, and if money is no issue, you can't go wrong, as I did not a see a budget listed, so this one of my favorite traps to jump into.

Try to find an eclipse Titanium sub....those are known to be badass in both SQ and SPL

oh wait, it just so happens I have one for sale

holla

Morel Ultimo would be a good choice for SQ and general subby-ness.
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imo:

beyond audio inhuman, Sonic FX Q, SSA Icon, 04-05 re xxx, adire brahma, list goes on.

I'd stay away from the eD sub myself due to poor customer service and low build quality.

other options are FI Q, Sundown Audio Nightshade, RD alphas.. the critical mass sub is nice as well but really only worth it if weight is an issue or you're just a fan of neo.

Truly the best sub in sql terms will be subjective and up to the listener.

I'm pretty happy with my jbl w15gti, does okay at SQ and can get decently loud and affordable

I always forget to mention those, definitely agree with you. Cost for SQ value are very nice on those. :smilie_da

Focal 40KX. uncomprimised loud as hell SQ