You're not weak at LW especially once Benn finally gets back on the ice. Dupuis playing with Kennedy and Malkin...talk about production opportunities. Morrow is your only semi-weak LW - you just simply have more RW options than LW which isnt that terrible.
I'd trade Selanne and Johnson for Doughty. Leave it at that. Don't trade Mike Smith unless you'd rather have Yandle as well.