I'm not quite sure what twice as good means, but I have owned the ST-140 (not 2140), and the Stratos and they are in completely different leagues. The Stratos whipped it thoroughly in every category imaginable. My advice would be to get the Stratos with the cap upgrade if you can afford it. Like an earlier poster said, Klaus will bend over backward to satisfy his customers and it's resell value runs 85-90% of list. You can also upgrade to a dual mono design (same as monoblocks) down the road if needed.
Good luck!
Beez
Good luck!
Beez