I think the two areas to improve are depth and D. Picking up Spurgeon would be perfect, pairs nicely with Erik K, creates a Ceci - Wiercioch pairing on the second line. That means Phillips can just be Depth, what he really is at this point in time. Also, as other people have mentioned, players like Fleishman, Spaling and Abdelkader, or a combination of players like them, would beef up lines three and four. If you can create cap space, without trading away the young core, Okposo would be an upgrade over Stone. That however should not be a priority. Andersen is too expensive, and Lehner still needs a chance. Kesler is Solid but at his age would not be a good addition to the top 6, he does not fit the age of the core, which would make Okposo the better option if it comes to that.