ATM the cost for a bonafide top-6 winger would be an arm, a leg, and our 1st. Teams are all pretty much set on their roster and no team (besides maybe Buffalo) is counting itself out without having played a game.
Kane and Eberle have been pretty well discussed by us on here for a while now, Perron also makes sense, Stewart from Buffalo would fit, maybe Cammalleri who is on the last year of his contract in Calgary. Problem is, there's a number of fits from teams in our division, but I doubt they'd want to help us at the moment (Islanders, Devils, Canes, and Washington being the teams I'm thinking of). Rick Nash as a large RW veteran powerforward would be a fit too but... yeah we won't go there (his recent spate of injuries being a great reason not to).
Boston and Chicago could be seeking more cap relief in which case we'd see more opportunities.
This management group could do anything, but it doesn't seem to make sense to make a trade right now. In a few months, maybe. The key is figuring out where Horton and the kids are at as well as letting some teams' playoff hopes die down.