Check out the Nola Thunderbolt, a terrific sub for music and HT. It retails for around $1700, although every once in a while a version one pops up for 1K +/-. The TB doesn't take up a lot of room and is relatively easy to place.
It will integrate well with your 1.6s - the TB was designed to be "fast" since it was intended to be mated with Alon's (now Nola Speakers) high end dipole speakers.
The Thunderbolt has very tuneful, *musical* and deep bass - bass impact but no boom. Much of the technology incorporated into this sub was developed through the designer's experience implementing his SOTA kilobuck reference system the Grand Exoticas (Harry Pearson's reference at The Absolute Sound.)
I attempted to mate subs with Maggies 10 years ago. It weren't easy. Wish I'd had the Thunderbolts back then.