Boy what an involved question. I will give you my opinion after having owned a 17lsI and having upgraded to the 16lsII of which I still own. The 16lsII as compared to the 17lsI is much more detatiled everywhere in the audio spectrum; it was a significant upgrade. I have not heard the 17lsII long enough to give an indepth opinion. What I did hear however did not make me want to sell my 16lsII and buy one; so maybe that says it all. However, if you owned an ART and enjoyed that you will be very close to that level of performance with the 16lsII. Good Luck.
Chuck
Chuck