I think I'd nominate Brian Bellows at right wing, if it's players that have ever been on the Caps. 1022 points in 1188 games, three-time all-star. And I'd second the votes for Fedorov and Langway of course.
At goalie, I'd go Pete Peeters for sure, and then I believe I'd go with Pat Riggin, and if you don't like Riggin, then Huet, or Malarchuk, based on their positions on the all-time adjusted GAA list here (#7, #27, #39, and #62 respectively): http://www.hockey-reference.com/lead...ed_career.html
Whatever you think about the list, I think the Peeters name being there in the top 10 of all-time, right between Jacques Plante and Patrick Roy, is enough to show he's the best Caps goalie ever.
I am assuming prime as caps. mike liut would have to be among the goalies if the it was his career prime.
kono-halpern-dahlen(that was maybe the caps best line like that even if there were players that were better like bengt and huntsie
brash-hunter-Hendricks..a real 4th line
I've analyzed this in depth and the best way to do it is taking into account the players time with the Capitals. Not the player in their prime if he wasn't here then (Oates, Fedorov, Bellows etc). And there is no place for Jaromir Jagr and his tanking on this list and should never be.