Papac sounds good. It's a bit difficult because he looks like a typical 4-4-2 defender and we vote for a 3-5-2 here, but I think he's the best one.
My second vote goes for Jürgen Hartmann because he surprised me that much. He was absolutely weg vom Fenster at the begin of the season and came back for the 100th time. Well, he is not exactly Roberto Carlos, but he knows that and is a clever enough guy to see his technical skills with some self-irony.
Of course this is a Vereinsbrille vote, but the funny thing is that even 80% of GAK-supporters would kill me for this, although I heard "Jürgen Hartmann"-chants this spring for the first time in 6 years. (After a rude foul to Vastic of course... )