Forgive me Nick for what I'm about to say.
I wouldn't take that trade. Lidstrom's time is getting short, while Doughty's best is yet to come. For this year and maybe next, if Lidstrom comes back, they'll be close in terms of production, but in this case I think you have to look long term. In a one year league I'd probably take it, but not in a keeper.
There's no guarantees beyond this year with Lidstrom and whether or not he retires. You don't have that with Doughty, let the other guy deal with that. I'd hate to see you lose an elite D-man, even if your getting my boy Nick.
Your beer mug isn't half-empty, your just half-way to the next refill.....