Any trade we make for an already proven top-flight winger will most likely involve at least two of:
5. 1st/2nd round pick
Moving Neal doesn't make sense because it's a lateral move at best. If Letang prices himself out of the Penguins' budget, he won't be shopped around until next season most likely. If Despres looks serviceable this year and Shero wants a class winger (which I suspect is not the case), I think he is the most likely to be moved with the addition of one of our blue-chip prospects and a draft pick. Even that might not get you a guy like Brown. Moving down to the second echelon of wingers I can see a lot of teams being interested in Martin conditional on the fact that he keeps playing well. Other than that we really don't have much to offer other teams. Nobody wants a collection of our scraps (Tangradi,Kennedy,Lovejoy,etc.).
A lot of teams with decent young offensive depth already have a stockpile of defensive prospects, like the Oilers. A lot of fans point to the Neal trade and say "look what RS did there!" and don't realize that the trade market, especially for prospects, is not perfectly liquid. There may not be teams that want to give producing assets for a 2-4 year project. Shero could have been shopping Goligoski for two years until Dallas, a team with an expendable young winger came along with a need for a puck moving defenseman.
While I'm a little sad that the first 8 years of Crosby's career has been spent centering Andy Hilbert, Mark Recchi, and Pascal Dupuis, I'm confident that Ray has a tentative plan and won't overpay for the sake of adding a few more goals to our top 5 offense.