I've been using D'addario and Elixir .011 - .049s for ages. Both are good sets of strings . . . leaning towards the D'addario's simply because they're so much cheaper though.
I like the D'Addario 11-52 (or DR 11-50) down to D standard, 11-56 for drop C or anything lower. It's a great balance between flexibility and playability.