You know, I really would like to try some Swan speakers as they are constantly recommended on headfi, but it's much more costly to buy and return speakers than it is to buy and return headphones (Which I did ~5 times before landing on my first $150 pair.) While I could have spent $200 (having that much disposable income at this time), I decided not to, and that if I didn't find something that worked well for me around $100, I'd be happy without it. Fortunately, I am happy with the sound of the Harman Kardon system I got, and since I don't need much bass, the tiny 6" sub is plenty for just a tiny amount of punch.
I might post back with further impressions since this is only the second day, but the two worst things so far are how directional the satellites are to get the full amount of treble, and the fact that I don't have a terribly good place to put the woofer. Other than that, when in the sweet spot the speakers disappear into the soundstage, and female vocals have a wonderful airy quality, (though not as refined and a bit more metallic sounding than my AD900.)
Also, and interesting Frequency Response graph I found after a lot of searching online:
Also, here is a video I put on youtube. It's a sound test, and the only one I know of that uses a decent microphone:
The subwoofer is as high as it will go, (thus the overall muddy sound, which is compounded by the position of the woofer... Not that I really use it that way, but anyway... maybe I'll try to make a more balanced sound test later.) See what you guys think. Any song recommendations for auditioning it? Maybe I'll put the woofer on half way next time; make it a bit more realistic for my use case.