I highly recommend the Alon (now Nola) Thunderbolt. Very fast, very musical, even nimble enough to pair with planars. They are certainly powerful enough for HT, but where they truly excell is with music.
I always thought I'd go the REL route - and I heard way more subs I *didn't* like than ones I did, including most of the suspects you listed. The TBs iintegrate very smoothly with speakers - they are almost undetectable, making the music sound like it's coming full range from your speakers - I used to switch them in and out just to be sure they were on. The TBs totally disappear, but the monitors had all the bass and punch they needed.
Carl Marchisotto has revised the TBs now, so there are a couple of the original TBs for sale here at $700-800 (they're $1695 new.)
I always thought I'd go the REL route - and I heard way more subs I *didn't* like than ones I did, including most of the suspects you listed. The TBs iintegrate very smoothly with speakers - they are almost undetectable, making the music sound like it's coming full range from your speakers - I used to switch them in and out just to be sure they were on. The TBs totally disappear, but the monitors had all the bass and punch they needed.
Carl Marchisotto has revised the TBs now, so there are a couple of the original TBs for sale here at $700-800 (they're $1695 new.)