Hi terzaghi,
Since you want portability, you should check out some of the systems from Tivoli Audio and Cambridge Soundworks. Since both of these companies benefited from design from the late brilliant engineer, Henry Kloss, the founder of Advent speakers, the "K" of the original KLH, and inventor of the video projector, I think you'd find a system that would sound much better and more neutral than systems from Altec Lansing, Panasonic, etc.
http://www.cambridgesoundworks.com/catalog/index.html I've owned portable systems that Kloss designed as far back as the late 1960s, and they were always superior in transparency and musical fidelity to competitors.
Regards,
Alan
