Which would I prefer? Well, I would prefer the Klipsch's for my SETs and the SVS's for HT use.
If you want a hyper revealing, accurate, squeaky clean sound, go with the SVS, but buy a bigger amp to drive them.
If you want a lively, dynamic sound, go with the Klipschs, use the Denon you currently have, and don't look back.
This is really an apples to oranges comparison. The Klipsch have a direct evolutionary link to the golden age of hi-fi prior to the development of transistor amps. They adhere to the high-efficiency approach to this day, and as a result are easy for any amp to drive, and can have a qute dynamic and lively presentation. They can also be 'shouty', with a more in-your-face presentation, a trait less pronounced when paired w/ tube amplification than w/ transistor amps. The SVS's on the other hand are the embodiment of product of the SS age: small, sealed, inefficient boxes that require tons of power to properly sing, but with ruler flat, neutral tonality otherwise. On paper, the SVS's would appear to be slightly superior, but the requirement for more power may make them ultimately more expensive.
It sounds like you are leaning toward Klipsch on aesthetic grounds anyway. Once you choose, don't second guess yourself (see CraigV's post above) and enjoy the music.
