The difference between a double run of Argent+ and a double run of Sterling 2 is enormous, an improvement in all aspects of a given performance, night and day. The Argent pales in comparison. I tried the Argent+/Streling2 in more than one system with the same results.
Sterling+ is again a jump up from sterling2.
Sterling+ is very similar to Dragon+ in my system difficult to tell them apart when not concentrating/ listening properly.
I found that Forest+ was better than Argent+ in the bass though the argent presented a clearer mid bass and up. Naturally the upper range of argent was superior to the Forest, just more air and detail.
Hope this helps