To be honest, the best way to save music is to put it on your computer and link to the B&O sound system using a beoport. The hard drive on the 3200 is a little bit of a pain as it doesn't name the tracks - you have to do that manually. The BS4 has the advantage of having a nice big display and will display the information stored on the computer - at least it does with a Mac. (Not sure if the latest incarnation does on PC).
One can save the music at whatever quality you want in this way where you are limited in quality with the 3200 which might be a nuisance now you have bought such good speakers. You can of course link to the 3200 in the exactly same way but the display is not as good because it is smaller.
If you prefer the styling of the 3200 over the BS4, stick with what you have.