Hey,
I have the DPS-10. Although it's ok, it does leave me feeling like I'm missing something. For movies, it's not bad at all... it doesn't have the greatest low frequency extension, but it's good nonetheless. For music, it lacks a bit of refinement, speed, and linearity. You may want to look elsewhere if you plan on doing a lot of critical listening. If you want loud boom, you've found your sub!
I don't have any experience with the Mirage. You may want to check out Hsu or Onix for affordable subs. I've heard good things about them, both here and elsewhere.
Just my two cents.
sleeper.
PS Keep the eq on "classical/jazz" at all times... for all types of listening.(DPS-10) It seems to have the flatest frequency response.