Actually, I understand the differences to be in the tapered cantilever and slightly different compliance. At the time they were fully reviewed, the sonic and measured difference was so small as to not bother with the dearer one, unless you preferred the blue body over red... [edit] - lest you think this is only opinion, I did sell both back in the day, although for some reason, the K9 ruled the grooves at this price - actually, the K9 cost more in the end 
Hasn't the 160 now been discontinued in any case?
I can't go on and I can't go back, I don't feel so matter of fact,
I tried and tried to make good sense, What's the good to try it all again?