I'd take a look at the PMC floorstanders in that price range that have been getting some very good reviews (I remember seeing one in Soundstage not too long ago). I think they feature transmission line bass that should satisfy your need for more complete bass response, and as the company has professional speaker roots I'd think they'd offer up good dynamics across the upper ranges as well. Not sure how they'd mate with your amp, so that's something to check out.
Since you like your Harbeths the other option would be to add a couple high quality subs from the likes of SVS, Rhythmic, etc. Of course you'd need to spend some time and $$ on integration hardware to get it dialed in right, so not sure if that's something you'd like to get involved with but it's another option.
Anyway, hope this helps and best of luck.
Since you like your Harbeths the other option would be to add a couple high quality subs from the likes of SVS, Rhythmic, etc. Of course you'd need to spend some time and $$ on integration hardware to get it dialed in right, so not sure if that's something you'd like to get involved with but it's another option.
Anyway, hope this helps and best of luck.