Suarez isn't coming to Arsenal, there's no chance of that (and to be honest, I prefer it that way)...
I'm a little confident that Arsene may surprise us again in January, and I'm going to take a punt and suggest that it may be Lewandowski.
Outside of the Bundesliga, we are the best suited for him in my opinion. We have a world renowned Manager who speaks fluent German, have a good number of German & Polish Players (well a couple of Polish) and he will be fed by the best No 10 in the World.
Manchester United don't have the same appeal now, and look how they've wasted Kagawa (they've ruined him in my eyes).