There isn't a player on the roster that I immediately believe needs to be traded, especially RIGHT now. I'm all for improving the team though, so whom I'd give up, really depends on who is coming back, how much cap space they would take, what their position is, and so on.
We need a guy like Ritchie, if he can play every night, the way he did last game... but outside of that, he's been extremely tradeable... especially for a $2.5 mil cap hit. We need him, especially for the playoffs, "if" he can demonstrate the desire (note, I say desire, not ability, he has the ability) to play that way all the time.
Holl is a guy that I have no issues with moving.. but we need a D man back, either in that trade, or a series of others. A Chiarot, a Lyubushkin type guy... someone who can play a physical playoff style.
I see Kerfoot mentioned, but he's been a useful player for us. Moving him, creates a hole elsewhere.
I'd ask about Crouse, Comtois, JT Miller, if these guys are available, and what the prices are. Then see how we make it work from there.
None of the big four should be moved at all during regular season. Should we bomb out in the playoffs, that's a new discussion.