Most definitely. The Tempest is even better (if you can live with the necessary enclosure size) and the Dayton DVC 12" and 15" are no slouches either. You can easily build fantastic subs with any of these drivers.
The Titanic requires a larger enclosure, costs a little more has a slightly lower Fs and has just over 0.3L more Vd. The difference between them is kinda like the difference between the SVS ISD and the CS+ driver.
For the cost of a Titanic driver I'd go with a Tempest or 15" Dayton DVC.
For home theatre useage I agree, defientely a Tempest or 15inch DVC would be a better chocie, but if you really need the smaller box, my 12inch MK2's great in it's 1.75cf sealed box. The MLS test on my MK2 shows that the Fs is right about 20hz...pretty decent. And yup it's Dumax is 18.9mm