Superuniti questions

Hi,

i just ordered a Superuniti at my local dealer to upgrade my nait 5i and soundcard setup. I hope this is the right choice. I tried a demo Superuniti at home before and it's a huge step between the 5i. Using analog connection from soundcard too there is much more punch and music. Connecting to Toslink gives extremely more clearness and even more music. But in comparison to upnp it sounds a bit too analytical and misses some sparcle and voicing. So in my oppinion the streamig is better.

Would it be better if I ordered the Nait XS and the nDac to beat the Superuniti? Or would that just make more details out of the Toslink but with the same lack in muscality too? And the Nait XS has not the same power.

And one other question:

When I tested the device at home I used Kinsky to try the sound. But this software only can playback a certain song you chose. Is there any windows based software wich allows me to browse and playback my music just like winamp? Or do I have to use an iPod/iPad?

Thanks for your help.