I would be comfortable dropping ennis, kesler is just shaking off cobwebs right now, wait on him.
as for the players to target, kinda hard to give advice on that. I'd target the bottom dwelling teams in your league. Maybe offer up Backstrom, Ennis and Ehrhoff for one good player and one struggling player. Usually works out great and the struggling owner will look at the offer as getting rid of his struggling player and gaining Backstrom. who in himself is struggling on a mediocre Washington team.
hope that helps