At the risk of starting a giant discussion, the truth is that almost no speaker sounds good at low volume. This is not the fault of the speaker, but rather the ear's nonlinear response at differing volumes. Do a search for "Fletcher-Munson curves". The suggestions above are correct: a loudness contour button (shudder) is going to get you closer to a "realistic" sound at low volumes than anything else.
In order to hear the proper balance, you have to play the recording at "live" levels, end of story. Listening at any other level results in the perception of an incorrect frequency response. Any speaker that seems to have a "correct" balance at low levels has a deliberately non-flat frequency response and will sound absolutely awful when played at "live" levels. It isn't possible to design for both situations simultaneously because the requisite frequency response is very different.
To answer your question directly, though, I would suggest Vandy 2c's. Due to their inherent "warmth", they tend to sound good at less-than-live levels (although the downside to this is that they sound thick and oppressive at live levels).
