A great choice...I think Mike's got it right SPL1200R>SB12+>SPL1000R. Also, though I haven't heard it, the new Plus, I'm told is a significant step toward a "sealed-like" overdamped sound with the benefits and efficiency of the port. Having owned the previous 12.3 Plus (ported)versions, I'll agree with pearsall001...it was a tremendous HT experience, but suffered from GD and overhang when compared to some sealed and servo subs for music. The Ultra13 is a totally different story, I've compared it, as Mike has, to the Velo DD series and subjectively prefer it, slightly, for music, absolutely, for HT.