How about Gretzky and Lemieux on the '87 Canada Cup team. That had to be a duo who put some fear into the opposition.
Agree this is clearly the winner. Imagine if somehow the Oilers had got Lemieux in the draft. And he played on a line with Gretzky and Kurri from say 84-85 through 93-94 for a good ten years. Would Lemieux have topped 100 goals with Gretzky setting him up? Would Gretzky have got 250 points? Would the Oilers have gotten over 500 goals in a season?
Soviet Union used to have some great lines during its heydey. Here are some:
Kharlamov - Petrov - Mikhailov (the best and most productive)
Krutov - Larionov - Makarov (might have been more skilled than the Petrov line but didn't produce as much and didn't last as long. Still the second best line in hockey history after the Petrov line)
Almetov - Alexandrov - Loktev (The best line in the Soviet union in the early 60's)
E.Mayorov - Starshinov - B.Mayorov (The other great Soviet line of the early 60's).
Firsov - Maltsev - Vikulov (Didn't last long but dominated when played together)
Yakushev - Shadrin - Shalimov (The feared Spartak line of the 1970's).
Kapustin - Zhluktov - Balderis (Could have been the best line in the world in the late 1970's, but this line didnt last more than a couple of seasons)
Lebedev - Bodunov - Anisin (The best line the Soviet Wings ever had. Played together for a whole decade (from 1971 to 1981). Also played as a line in the 1972 Summit Series.
Kapustin - Shepelev - Shalimov (The famous Spartak line of the early and mid 1980's. Was a key factor in the 1981 Canada Cup win).
Lavrentyev - Tyumenev - Kozhevnikov (The other good Spartak line of the 1980's. Kozhevnikov was a two time olympic champion and a member of the 1984 Canada Cup team as was Tyumenev. Tyumenev also won the 1979 Challence Cup.).
Yashin - Semenov - Svetlov (The most profilic line of the Dynamo Moscow of the 1980's. Played together in two Canada Cups (1984 and 1987)).
Varnakov - Kovin - Skvortsov (The best line of the Torpedo Gorky history. Played together in two Canada Cups (1976 and 1984) and in the 1979 Challence Cup where they excelled. Skvortsov was also a part of the 1981 Canada Cup team.
Kamensky - Bykov - Khomutov (Formed a great second line for the CSKA Moscow from mid to late 1980's).
Khmylev - Nemchinoc - Priakhin (The best line the Soviet Wings had in the 1980's).
Bure - Fedorov - Mogilny (They didn't last long as a line, but were pure magic).
Zelepukin - Titov - Kvartalnov (A solid Khimik line from the mid 1980's to early 1990's).
Nikolishin - Yashin - Kovalev (Didn't last long, but played very good together in Dynamo for a couple of years).
What also came to mind was the combination from Canada Cup: Gretzky-Lemieux. I do not think you can top that.
From NHL take either one and their sidekick (like Jagr or Kurri). Adam Oates and Brett Hull was a good one, too. Today's NHL I would say Heatley-Spezza.
Neither were fighters .... and the other member of the line that year: Reggie Leach with 61 goals during the regular season and 19 more in the playoffs. He became the first to ever score 80.
It's not their fists that concern me. The case could of course have been made for Clarke Leach also, I just used Barber because it bumped up the numbers higher. But really, that line in general was just downright scary.
Though I agree that Howe Lindsay probably was a better answer. Clarke-Barber just sprung to mind first.